Aquarium breach · deepseek-v4-flash

The user wants me to build a complex 2D aquarium-breach simulation as a single HTML file. Let me plan this out carefully and build it step by step.

Key requirements:
1. Intact glass tank with water, fish, rocks, plants, floating toy
2. Drag to create a visible crack vertically on one side below the waterline
3. Breach button to break the panel around the crack
4. Water exits in gravity-curved jet, waterline falls continuously
5. Outflow weakens as water level approaches the opening, stops when water no longer reaches it
6. Escaped water forms spreading puddle constrained by floor and room walls
7. Buoyancy, drag, current: rocks sink, toy floats, plants bend/drift, fish swim against current, some swept through
8. Objects leaving water transition to gravity-driven motion and collide with floor
9. Glass fragments rotate, collide, experience resistance in water
10. Reset restores initial state

Let me build this step by step. I'll create a comprehensive simulation.

Let me think about the physics model:

**Tank**: Rectangular glass tank with walls, water inside
**Water level**: Initially at some height, falls as water escapes
**Crack/Breach**: Vertical crack drawn by user on left or right side below waterline
**Water jet**: Exits from breach, curves downward due to gravity
**Puddle**: Forms on floor, constrained by walls

**Objects**:
- Rocks: sink to bottom, heavy, unaffected by current much
- Fish: swim, affected by current, some swept away
- Plants: bend with current, anchored at bottom
- Toy: floats on surface, can be carried by flow
- Glass fragments: from broken panel

**Physics**:
- Simple particle-based water simulation using "water particles" that exit through breach
- Objects have position, velocity, mass, buoyancy
- Current velocity field approximated based on water flow direction
- Collision with floor, walls, tank walls

Let me code this. I'll use canvas for rendering.

Let me think about the structure:

1. State management
2. Physics update loop
3. Rendering
4. User interaction (drag crack, breach, reset)

I'll model:
- Water as particles (simplified - a number of water droplets that exit)
- Water level tracked as a scalar that decreases
- Objects as physics bodies with position, velocity, mass, volume (for buoyancy)
- Current as a velocity field that varies based on position relative to breach

Let me start writing the code.

Here's my plan for the tank layout:
- Canvas: let's say 800x600
- Tank: positioned in the center-left area, maybe 400x350
- Room: the canvas represents the room, with floor at bottom
- Tank left wall at x=100, right wall at x=500, top at y=50, bottom at y=400
- Water level initially at y=100 (so water height = 300)
- Floor at y=450 (or bottom of canvas at y=600)

Actually, let me think about a better layout:
- Canvas: 900x650
- Room walls: left at 0, right at 900, floor at y=600, ceiling at y=0
- Tank: left at 150, right at 550, top at 50, bottom at 400
- Water initial level: y=80 (water height = 320)
- Breach on the right side (x=550)

Let me start coding this.

Actually, let me think about this more carefully. The breach is on one side - I'll allow the user to drag on either the left or right side of the tank. Let's say the right side for simplicity.

Let me write the full implementation now. I'll be thorough but keep it reasonable.

Key classes/objects:
- `Tank`: position, dimensions, water level, walls
- `WaterParticle`: for water droplets exiting the breach
- `Puddle`: water on the floor
- `PhysicsObject`: rocks, fish, toy, plants, glass shards
- `Breach`: position, size

Physics update:
1. Calculate water pressure at breach based on water height above breach
2. Emit water particles from breach with velocity based on pressure
3. Update water level (decrease based on outflow rate)
4. Apply forces to objects (buoyancy, drag, gravity, current)
5. Update puddle

Let me write this now. I'll aim for a complete, working simulation.

Actually, let me think about how to model the current/flow field. Water flows from the tank through the breach. The flow is strongest near the breach and in the direction toward the breach. I can approximate this as:

- Inside the tank: water flows toward the breach (horizontal component toward the breach side)
- Outside: water flows out and down

For objects:
- In water: affected by buoyancy, drag from current, gravity
- Out of water: only gravity, collision with floor

Let me code this up. I'll write it all as one HTML file.

Let me think about what "dragging a crack" means. The user clicks on the tank side (left or right) and drags vertically to create a crack line. This crack defines where the breach will open.

OK, I'll implement this now. Let me write the full code.

```html
<!DOCTYPE html>
<html>
<head>
<style>
  /* styles */
</style>
</head>
<body>
<canvas id="canvas"></canvas>
<div id="controls">
  <button id="breachBtn">Breach</button>
  <button id="resetBtn">Reset</button>
  <span id="status">Drag on tank side to create a crack</span>
</div>
<script>
// ... full simulation
</script>
</body>
</html>
```

Let me write the complete JavaScript now. I'll model everything with particles and simple physics bodies.

Let me design the physics more carefully:

**Water outflow model:**
- The breach is at position (breachX, breachY) with height = crackHeight
- Water pressure at depth h: P = ρgh
- Flow velocity through breach: v = sqrt(2gh) (Torricelli's law)
- Flow rate: Q = C * A * v where C is discharge coefficient, A is opening area
- Each frame, emit water particles at rate proportional to Q
- Water level drops as water exits

**Current field:**
- Inside tank: water moves toward breach. The horizontal velocity component increases as you get closer to the breach. The vertical component is small (toward the breach if it's at a certain Y position).
- Simple model: For a point (x,y) inside the water, the current velocity is directed toward the breach position, with magnitude proportional to 1/distance (or some function) and scaled by the overall flow rate.

**Buoyancy:**
- Buoyant force = ρVg where V is the volume of the object submerged
- Objects with density > water sink, < water float
- Partially submerged objects have buoyancy proportional to submerged volume

**Drag:**
- Drag force = 0.5 * ρ * Cd * A * v² (opposing velocity)
- Simplified: drag = k * v where k depends on object shape

**Fish behavior:**
- Fish try to swim against the current (negative velocity toward breach)
- But if current is too strong, they get swept
- Fish have a "swim speed" that they use to fight the current

**Glass fragments:**
- When breach happens, the panel between crack and tank edge breaks into fragments
- Fragments have initial velocity from the water pressure
- They rotate, experience drag in water, gravity in air

Let me code all this now. I'll aim for something that looks good and works well.

Let me write it:

```javascript
const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');
canvas.width = 900;
canvas.height = 650;

// Room dimensions
const ROOM = { left: 0, right: 900, floor: 600, ceiling: 0 };

// Tank
const tank = {
  left: 150, right: 550,
  top: 60, bottom: 420,
  wallThickness: 8,
  get width() { return this.right - this.left; },
  get height() { return this.bottom - this.top; }
};

// Initial water level (y coordinate of water surface)
const INITIAL_WATER_Y = 90;
let waterY = INITIAL_WATER_Y;

// Breach state
let crack = null; // { x, y1, y2 } - x is tank side (left or right), y1,y2 are crack endpoints
let breached = false;
let breachOpening = null; // { x, y1, y2, width }
let glassFragments = [];

// Water particles (exiting through breach)
let waterParticles = [];
let puddle = { x: 0, y: 0, width: 0, height: 0, water: [] }; // puddle on floor

// Objects
let objects = [];
let fish = [];
let plants = [];
```

Hmm, this is getting complex. Let me just write the whole thing.

Actually, let me think about this differently. I'll write a complete, working simulation. Let me focus on making it work well with clear physics.

Here's my refined plan:

**Canvas layout:**
- 1000x700 canvas
- Room: full canvas, floor at y=620
- Tank: centered, left=200, right=550, top=80, bottom=430, wall thickness=10
- Water: initially from top of tank (y=80) to water surface at y=110, so water height = 320 (from y=110 to y=430)

Wait, let me reconsider. The tank has walls. Water is inside. The water surface is at some y position. Initially water fills from the bottom of the tank up to the initial water level.

Let me finalize dimensions:

```
Tank: 
  left: 180, right: 520 (width: 340)
  top: 80, bottom: 420 (height: 340)
  wallThickness: 6 (visual thickness)

Water initially:
  surfaceY: 100 (water fills from tank bottom y=420 up to y=100)
  waterHeight: 320

Breach (user draws on right wall at x=520):
  The user drags vertically on the right side of the tank
  Crack recorded as { x, y1, y2 }

Room:
  walls: x=0, x=1000, floor: y=650
  Actually, let me have room floor at y=600
```

OK let me just write it. I'll figure out exact dimensions as I go and test with the browser.

Let me write the complete HTML file now. I'll be comprehensive.

Let me think about the visual design too:
- Tank: Glass look with blue-ish tint
- Water: Semi-transparent blue
- Fish: Colorful shapes (simple triangles/ellipses)
- Rocks: Gray/brown rounded shapes
- Plants: Green wavy shapes from bottom
- Toy: Bright colored (e.g., yellow duck or red ball)
- Glass fragments: Sharp shards
- Puddle: Blue puddle on floor
- Water jet: Blue stream of particles from breach

OK, let me write the complete code. This will be a long file but self-contained.

I'm going to write it all at once and then test/debug.

Here's my approach for the simulation loop:

1. `update(dt)` - update physics
2. `render()` - draw everything
3. `gameLoop()` - requestAnimationFrame with time tracking

For the physics, I'll run a fixed timestep sub-loop inside update.

Let me now write the complete code. I'll be very thorough.

Let me think about the fish behavior more carefully:

Fish have:
- position (x, y)
- velocity (vx, vy)
- target position (where they want to be)
- swim speed
- A "fear" response to current - they try to swim away from the breach

Actually, fish will:
1. Normally swim around in the tank
2. When current starts flowing (after breach), they try to swim against it
3. If current is too strong, they get swept toward and through the breach
4. Once through the breach, they fall with gravity and land on the floor

Fish that are swept through the breach:
- They exit the tank, fall with gravity
- They flop around on the ground
- They become "beached"

Let me implement all of this.

OK, I realize I should just start writing the code. Let me do it.

Let me think about one more thing - how to detect if an object fits through the breach opening. The breach opening has a certain width (crack size + some panel breakage). Objects with size smaller than the opening can pass through.

Also, for glass fragments: when the breach is triggered, the panel between the crack and the tank edge breaks into fragments. So if the crack is at the top (y1) and bottom (y2) on the right wall, the glass panel between the crack and the right edge of the tank... wait, the crack IS on the right wall. So the panel that breaks is at the breach location.

Actually, the breach is ON the tank wall. The user draws a crack on the tank side (left or right wall). When breach is triggered, that section of the wall breaks open.

So the glass fragments come from the broken wall section at the breach location.

Let me think about the breach geometry:
- User draws crack on right wall: crack = { side: 'right', y1, y2 }
- Breach opening = that section of the wall is removed
- Glass fragments = shards that fall from that opening

The opening is a rectangle at (tank.right, y1) with width = wallThickness and height = |y2-y1|... hmm, but the wall is thin. Let me make the breach opening have a certain width that extends into the wall.

Actually, the wall is like a flat panel. When breached, the section breaks into fragments that can fall. The opening is an empty space where the wall used to be.

Let me simplify: the breach creates an opening in the tank wall. The opening is a vertical slot of a certain width (the crack width + some breakage). Water flows out through this opening.

OK, I'm going to just write the full code now. Let me do it.

Let me write a comprehensive implementation:

I'll structure the code as follows:

1. Configuration / constants
2. State variables
3. Physics objects class
4. Fish class
5. Plant class
6. Glass fragment class
7. Water particle class
8. Puddle model
9. Initialization
10. Physics update
11. Rendering
12. User interaction (mouse handlers)
13. Button handlers
14. Main loop

Let me write it now.

For the puddle, I'll use a simple approach: water particles that hit the floor spread out. Or I can track puddle as a volume that spreads on the floor, constrained by room walls.

Actually, a simpler approach for the puddle: track the total volume of water that has escaped. The puddle is a rectangular region on the floor that grows in height and spreads. The puddle has a certain height (depth) and width. It spreads until hitting room walls.

Water particles that hit the floor add to the puddle. The puddle spreads horizontally, constrained by room boundaries.

Let me implement the puddle as a series of columns - each column has a water height, and water spreads between columns. This is a simple 1D shallow water model.

OK actually, let me just use a simpler model. The puddle is a circular or elliptical region on the floor. It grows as water is added. The height of the puddle is volume/area. When the puddle reaches the room walls, it stops spreading horizontally and just gets deeper.

Actually even simpler: track the puddle as a rectangle. Water volume = area * height. As water is added, the puddle expands outward until it hits walls, then it just gets deeper.

Let me keep it simple. I'll model the puddle as a 1D array of "cells" along the floor, each with a water height. Water flows between adjacent cells based on height difference. This gives a nice spreading effect.

Let me implement this now.

I think I've planned enough. Let me write the full code.

Let me write the complete index.html. I'll aim for quality and completeness.

One more design decision: which side does the breach happen on? I'll let the user drag on either the left or right side of the tank. On the right side (x=tank.right) or left side (x=tank.left).

The crack is drawn by the user as a vertical line on one side. When they click and drag on the tank wall, it creates the crack.

Let me code it up. Here's the full file:

Actually, let me write this in chunks to not be overwhelmed. I'll write the full file using the write tool, then test and fix.

Let me write a complete, working implementation. I'll be thorough.

Let me trace through the key interactions carefully to make sure all the required behaviors are there.

Here's my plan for the HTML structure:

```
Canvas (900x650) with tank scene
Below canvas: controls bar
  - Instructions text
  - Breach button
  - Reset button
  - Status text
```

Let me write it now. I'll be comprehensive in the physics model but keep the code clean.

I think the best approach is to write the file and iterate. Let me write a first complete version.

One thing I want to make sure: the crack is drawn as the user drags. So when the user clicks on the tank wall (left or right side) and drags vertically, a red line appears showing the crack. Then when they click "Breach", the wall breaks at that crack.

Let me code this now. I'll write a complete working version.

Here's my detailed code plan:

```javascript
// Constants
const GRAVITY = 980; // px/s²
const WATER_DENSITY = 1.0;
const WATER_VISCOSITY = 0.01;
const MAX_WATER_PARTICLES = 500;

// Tank setup
const TANK = { ... };

// State
let waterLevel;
let crack = null;
let isDragging = false;
let breached = false;
let waterParticles = [];
let objects = [];
let fish = [];
let plants = [];
let glassShards = [];
let puddle = { columns: [], waterVolume: 0 };

// ... etc
```

OK I'll just write it all now. Let me go.

Let me think about the code structure one more time.

Actually, for the puddle I'll use a simpler approach - just track escaped water volume and render it as a spreading blue region on the floor. The puddle area grows as more water escapes, constrained by room walls.

Let me implement the full simulation now.

I'll model:
1. Water level in tank (single scalar)
2. Water particles emitted from breach (for visual jet effect)
3. Objects with physics (rocks, fish, toy, plants, glass)
4. Puddle on floor (tracked as volume that spreads)

For the water current, I'll compute a velocity field:
- Inside the tank, water flows toward the breach
- The velocity magnitude depends on: distance from breach, water level height
- Direction is toward the breach position

Simple current model:
```
function getCurrent(x, y) {
  // Returns {vx, vy} at position (x, y)
  if (breached && waterLevel < y) return null; // above water
  // Current direction is toward breach
  let dx = breachX - x;
  let dy = breachY - y;
  let dist = Math.sqrt(dx*dx + dy*dy);
  if (dist < 1) return {vx: 0, vy: 0};
  // Speed decreases with distance, increases with water pressure
  let pressure = Math.max(0, waterLevel - breachY); // height of water above breach
  let speed = pressure * 0.5 / (1 + dist/50);
  return { vx: dx/dist * speed, vy: dy/dist * speed };
}
```

For fish swimming: they have a "swimVelocity" that they add to the current velocity. Their swim velocity is toward their target (some random point in the tank, or away from the breach). If the current is too strong, they can't overcome it and get swept.

OK, let me write the full thing now. I'll be very thorough.

Let me also think about the visual style:
- Clean, modern look
- Semi-transparent water with a subtle gradient
- Darker tank frame (glass effect)
- Colorful fish
- Green plants
- Gray rocks
- Bright toy
- Blue water particles for the jet
- Red crack line before breach

OK, writing the code now...

Let me think carefully about the rendering order (back to front):
1. Room background (floor, walls)
2. Tank back wall
3. Water inside tank (semi-transparent blue)
4. Objects inside tank (behind water surface)
5. Water surface line
6. Plants (behind water, anchored at bottom)
7. Fish
8. Rocks
9. Toy (floating on surface)
10. Tank front wall and side walls
11. Crack / breach opening
12. Glass shards
13. Water particles (jet)
14. Puddle on floor
15. UI overlays

Actually, the rendering order is important for the glass tank look. Let me think...

The tank has walls on all 4 sides. The front and back are transparent (we see through them). The water is inside. Objects are inside the water or on the surface.

For a nice visual:
1. Draw room background
2. Draw puddle on floor
3. Draw tank back wall (slightly darker)
4. Draw water fill (inside tank, semi-transparent blue)
5. Draw objects in water (rocks at bottom, plants from bottom, fish swimming, toy floating)
6. Draw water surface line
7. Draw tank frame (thick lines for walls)
8. Draw breach opening (break in the wall)
9. Draw glass shards
10. Draw water jet particles
11. Draw crack line (if not yet breached)

OK, let me write the complete code now. I'll aim for a working simulation with all the required features.

Let me write it now.

One more thing - for plants bending/drifting with current: each plant is a series of segments (like a chain). The bottom is anchored at the tank floor. Each segment experiences drag from the current, causing the plant to bend in the direction of flow. When there's no current, plants stand upright.

For simplicity, I'll model each plant as a set of control points that form a curve, with the bottom anchored.

Let me use a simple approach: each plant has segments (points from base to tip). The base is fixed. Each segment has a position that's influenced by:
- Restoring force (trying to keep the plant straight/vertical)
- Drag from current
- Gravity (slight downward pull)

This gives a nice bending effect.

OK, I'll implement plants as a series of points with spring-like physics.

Let me write the full code now. This is going to be a substantial file. Let me be efficient and write it all.

I'll write it directly using the write tool.

Alright, let me draft the full code in my head and then write it.

Actually, I'll write it step by step. Let me start with the HTML structure and CSS, then add the JavaScript.

Let me write the complete file now:

Let me test this in the browser to check how it looks and find issues.

Let me take a screenshot to see the visual rendering.

The browser tool doesn't support images. Let me check the console output and try to interact. Let me inspect the DOM and see if there are any JavaScript errors. Let me first check for console errors.

No JS errors reported. Let me try to interact and see if the simulation works. Let me try clicking on the tank wall to create a crack, then breach. Let me click on the right side of the tank first to draw a crack.

The tank right wall is at x=560, and the tank top is at 60, bottom at 410. Let me click around x=560, y=200 to start.

Hmm, the status didn't change. Let me check the mouse events. The issue might be that the canvas coordinates need to account for scaling. Let me check how the canvas is being rendered and what the actual mouse coordinates are.

Actually, let me re-read my event handler code. The mouse position calculation looks correct:
```
const scaleX = canvas.width / rect.width;
const scaleY = canvas.height / rect.height;
const mx = (e.clientX - rect.left) * scaleX;
const my = (e.clientY - rect.top) * scaleY;
```

This should work. Let me try clicking and dragging more carefully. Maybe I need to hold and drag. Let me try clicking at a different position. Actually, the tank right wall is at x=560, and the canvas is 920 wide. Let me check if the canvas is visible properly.

Let me check if there are rendering issues with a different approach - let me try to use the motion feature to see what's happening.

Actually, wait - maybe the issue is that when I click, I'm not dragging enough. The crack requires at least 15 pixels of drag. Let me try clicking at x=558, y=200 then dragging down to y=300.

Let me try using drag action.

Still no status change. Let me check if the events are firing correctly. Maybe the issue is that the click coordinates are off. Let me try different coordinates. The canvas is 920x640 but it's being displayed at a different size. Let me check the actual rendering.

Actually, let me try to use the `type` action to see what's on the page, or let me check more carefully.

Wait - the "dom" output only shows the button text and not the canvas, which makes sense because the canvas is a rendering surface, not DOM content. The status is in a span. Let me look more carefully:

The DOM output shows: "💥 BREACH\n🔄 RESET\nClick & drag on a tank wall to draw a crack"

So the status span shows "Click & drag on a tank wall to draw a crack" - this is the initial state. When I click and drag, it should update. Let me try clicking slightly more accurately.

Actually, looking at the tank dimensions: TANK.left = 160, TANK.right = 560. The canvas is 920px wide. The viewport is 1200x800. So the canvas might be rendered at a size where the coordinates don't align.

Let me try the click at various positions and check if the event seems to work. Let me try at (400, 300) first (center of tank), then at (560, 200) for the wall.

Actually, let me think about this differently. The issue might be that the browser tool uses a viewport of 1200x800, and the canvas has a CSS size that's being computed, but I'm passing pixel coordinates that might not match.

Let me use `motion` to see what's happening on the canvas.

Let me try to debug by checking for JS errors in the console or checking if the canvas is actually rendering. Let me try using console injection.

Actually, let me try to type into the console to evaluate JavaScript.

Let me inspect the canvas context more carefully. Actually, I think the issue might be that the browser tool cannot see canvas content via screenshots (the model doesn't support images). Let me just try to interact and see if things work.

Let me try clicking at a few different positions and check if the status text changes.

The status text hasn't changed at all. This suggests the mousedown event on the canvas isn't firing, or my event handler isn't working. Let me try to debug this. Let me look at my code more carefully...

Actually, I think the issue might be that the canvas is inside a container that has padding, and the click coordinates are being computed wrong. Or maybe the canvas element is not being found properly.

Let me look at the HTML structure:
- canvas with id="c"
- The mouse event listener is on `canvas`

Wait, let me re-read my code. The variable is `canvas = document.getElementById('c')`. The event listeners are on `canvas`. That should work.

But the status span has id="status" and it starts with "Click & drag on a tank wall to draw a crack". Let me check if anything happens when I click.

Actually, could the issue be that the mouseup event fires immediately after mousedown because the browser tool's click action might not properly simulate a press-and-hold? Let me try the drag action which should do mousedown, mousemove, mouseup in sequence.

Let me try the drag at the correct position again with a wider range.

The status text is not changing at all. This suggests either:
1. The mouse events are not reaching the canvas
2. The coordinate calculation is wrong
3. There's a JavaScript error somewhere

Let me check if there's a JavaScript error by trying to see if there's an error in the console. The console output only shows the sandbox warning. Let me try to add a quick console.log to debug, or better yet, let me check my code more carefully.

Actually, wait - maybe the event listeners aren't working because `canvas` is being resolved correctly but the click coordinates using `getBoundingClientRect` are being computed relative to the wrong position.

Let me re-read my code:
```javascript
canvas.addEventListener('mousedown', (e) => {
  const rect = canvas.getBoundingClientRect();
  const scaleX = canvas.width / rect.width;
  const scaleY = canvas.height / rect.height;
  const mx = (e.clientX - rect.left) * scaleX;
  const my = (e.clientY - rect.top) * scaleY;
```

This looks correct.

Wait, let me look at the user's coordinate system. The viewport is 1200x800. The canvas is inside a div with class "container" which has padding. Let me think about where the canvas might be rendered.

With a 1200x800 viewport, the canvas with width=920 and height=640 should fit well. It's inside a container with padding:20px, border-radius:16px, display:flex, justify-content:center, align-items:center.

So the canvas would be centered horizontally in the viewport. The left edge of the canvas would be roughly (1200-920)/2 = 140 from the left viewport edge, plus 20px padding = ~160. Let me calculate more precisely.

Actually, the container has `justify-content:center` and `align-items:center`, so it centers its content. The body also has `display:flex; justify-content:center; align-items:center; min-height:100vh`.

So the container is centered in the viewport. The canvas is inside the container. With the container having padding:20px, the canvas is padded by 20px inside the container.

So the canvas left edge = (viewportWidth - containerWidth)/2 + containerPadding

containerWidth = canvasWidth + 2*padding = 920 + 40 = 960

canvas left edge in viewport = (1200 - 960)/2 + 20 = 120 + 20 = 140

So to click on the right tank wall at x=560 in canvas coordinates, I need to click at viewport x = 140 + 560 = 700.

Let me try this.

Actually wait, the `getBoundingClientRect()` returns the position of the canvas element. The event uses `e.clientX` which is relative to the viewport. And I subtract `rect.left` from it. So if the canvas starts at x=140 in viewport, clicking at x=700 viewport would give canvas x = 700 - 140 = 560, which is correct.

But the browser tool's x,y coordinates - are they viewport coordinates or...? Let me check the tool description: "Coordinates use a 1200×800 viewport." So the x,y I provide should be viewport coordinates. Let me recalculate.

So to click at canvas position x=560, I need viewport x ≈ 140 + 560 = 700.
To click at canvas position y=200, I need viewport y ≈ (viewport canvas top) + 200.

Let me figure out the canvas top position:
- body has min-height:100vh, flex, centered
- container has padding:20px
- canvas height = 640

The container height would be roughly 640 + 40 = 680. Centered vertically in 800 viewport: (800-680)/2 = 60 from top.
Canvas top from container top = 20px padding.
So canvas top in viewport = 60 + 20 = 80.

So viewport y for canvas y=200 = 80 + 200 = 280.

Let me try clicking at viewport (700, 280) which should be canvas (560, 200) - the right tank wall.

Now we're getting somewhere! The click registered, but the crack is 0px because it was just a click without drag. Let me now try a drag action at the correct coordinates. I need to drag from canvas (560, 180) to (560, 280) which in viewport coordinates would be approximately (700, 260) to (700, 360).

Wait, actually it showed "Crack too short (0px)" which means mousedown fired, the crack was set with y1=y2=my, but then mouseup happened right away (since click is mousedown+mouseup without drag). In my code, on mouseup, if crack.y2-crack.y1 < 15, it resets crack to null and shows the "too short" message. So the interaction is working!

Now let me try a proper drag.

Excellent! The crack was successfully created! The status now shows "Crack ready! Press Breach to break the tank." Let me now click the Breach button and also check if the Breach button is enabled.

Let me click the Breach button. The button is in the controls div below the canvas. Let me find its approximate position.

The canvas is at about y=80-720 (80 top + 640 height). The controls div is below with margin-top:12px. So the controls start around y=732. The buttons are probably around y=742-762.

Let me find the button by clicking on likely positions.

The Breach button is at viewport x = canvas left + (canvas center) = 140 + 460 = 600 (approximately). Let me try clicking there. Actually, the controls are in a flex container below the canvas. Let me find the button positions more carefully.

The container is 960px wide (920 canvas + 40 padding). The controls div has display:flex, items center, gap 12px. The Breach button is the first button. Let me estimate.

Canvas viewport bounds: ~left=140, top=80, right=1060, bottom=720
Controls start at ~720+12 = 732

The buttons are in a flex row. The first button "💥 Breach" would be at about x = 140 + ~20 = 160 (container padding left = 20px, estimated).

Let me try clicking near (160, 750).

Hmm, that didn't work either. Let me look more carefully. The "dom" output shows button text but not a changed status. So the Breach button click didn't trigger.

Wait, I think I need to check if the Breach button is actually at those coordinates. Let me try to click at various positions to find it.

Actually, let me look at the DOM structure. The status shows that the Breach button text is "💥 BREACH" and the status text is "Crack ready! Press Breach to break the tank." which suggests things are working but I'm not hitting the right click spot for the button.

Let me try clicking more precisely. The button has padding:10px 24px so it's fairly large. Let me try x=200 which should be close.

Actually, wait - maybe the issue is that when I click the breach button, the breach triggers and updates the status but the status text still shows the old one because the page hasn't been refreshed or the response is from before the click. Let me try clicking the button and then checking after a short delay.

Actually, let me look at what `dom` shows more carefully. It shows the text content of DOM elements. After clicking the breach button, if the breach is triggered, the status should change to "🔥 Breach! Water escaping!" and the breach button should become disabled.

The fact that it still shows "Crack ready! Press Breach to break the tank." means the click didn't reach the button. Let me try scanning more positions.

Let me try x=160, y=750.

Let me try to get a better sense of positions. Let me try clicking at the center of the canvas to see if clicks work there, and then try the button at a different Y coordinate. Maybe the controls are lower than I think, or the buttons are positioned differently.

Actually, looking at my CSS:
```
.controls {
  display:flex; align-items:center; gap:12px; margin-top:12px; flex-wrap:wrap;
}
.controls button {
  padding:10px 24px; border:none; border-radius:8px; font-weight:700; font-size:14px;
}
```

The buttons are 14px font + 20px padding (top+bottom) = ~34px height. With flex gap of 12px.

The container padding is 20px. So the controls are at:
- The container starts at some viewport Y position
- Canvas: viewport top ~80, canvas bottom = 80 + 640 = 720
- Controls margin-top:12, so viewport top of controls = 720 + 12 = 732
- Container padding bottom = 20, so controls bottom = 732 + ~40 = 772

The first button "💥 Breach" should be at about x = container left + padding = ~140 + 20 = 160, y = ~732 + (controls height/2) = ~752.

Let me try x=180, y=752 to be safe.

Let me try a different approach. Let me click on the left side of the container first to find where it is, then work from there.

Actually, I just realized something. Let me look at the container structure again:
```
<div class="container">
  <canvas id="c" width="920" height="640"></canvas>
  <div class="controls">
    <button id="breachBtn">💥 Breach</button>
    <button id="resetBtn">🔄 Reset</button>
    <span class="status" id="status">...</span>
  </div>
</div>
```

The container uses `display: flex; justify-content: center;` on the body, not on the container itself. The container is a regular block element. With `width: fit-content` implicitly, it expands to fit its children. The canvas is 920px wide.

The body has `display:flex; justify-content:center`, so the container is centered.

Container width ≈ 920 + 40 = 960px
Viewport = 1200px
Container left edge ≈ (1200-960)/2 = 120px
Canvas left edge ≈ 120 + 20 = 140px ✓ (matches my earlier calculation)

Canvas bottom = 140 + 640 = 780... that's getting close to viewport bottom (800). Let me re-check.

Actually, the body's min-height is 100vh (800px). The container has padding:20px, so:
- Container height = canvas height (640) + top padding (20) + controls (about 40) + bottom padding (20) = 720

Wait, the controls are below the canvas. So:
- Top padding: 20px
- Canvas: 640px
- Controls margin-top: 12px
- Controls: about 40px
- Bottom padding: 20px
Total: 20 + 640 + 12 + 40 + 20 = 732px

Centered vertically in 800px viewport:
- Container top = (800 - 732) / 2 = 34px

Canvas top = 34 + 20 = 54px
Canvas bottom = 54 + 640 = 694px
Controls top = 694 + 12 = 706px
Controls bottom = 706 + 40 = 746px
Container bottom = 706 + 40 + 20 = 766px

So the Breach button should be at approximately y = 706 + 20 = 726px.

Let me try clicking at x=160, y=726.

The Breach button worked! The status now shows "🔥 Breach! Water escaping!" and the breach should be triggered. Let me now check what happens after a few seconds - the water should be draining, water level falling, etc.

Let me wait a moment and reload to see the updated state.

Let me check the state now. The simulation should be running with water escaping.

The simulation is running. The status still shows "🔥 Breach! Water escaping!" which is expected since it doesn't change after breach is triggered. The button should be disabled now. Let me try the Reset button to verify the reset functionality works.

But first, let me check if things are working visually. Let me try clicking the Reset button.

The Reset button click didn't seem to work. Let me try different coordinates for the Reset button. The buttons are in a flex row with gap:12px. The Breach button is first, Reset button is second. If Breach is at x=160 (container left + padding + button left padding), then Reset would be at approximately 160 + breachBtnWidth + 12px gap.

Breach button "💥 Breach" - the text is about 70px wide + 48px horizontal padding = ~118px. Next button starts at ~160 + 118 + 12 = ~290.

Let me try clicking at x=290, y=726.

The Reset button worked! The status is now "Click & drag on a tank wall to draw a crack" which means the scene was restored to its initial state.

Let me now do a proper test cycle:
1. Create a crack ✓
2. Trigger breach ✓
3. Wait some time for water to drain ✓
4. Reset ✓

Now I need to check if the physics is working correctly. Let me check a few things by doing another pass - create a crack, breach, wait, then check if the water level is falling properly.

Actually, let me look at my code for potential issues. Let me read the file and check for any bugs.

Key things to check/fix:
1. The crack drawing - right now it uses random jitter each render which will make the crack flicker. I should fix this to be stable.
2. The water level should drop - let me verify the physics
3. Fish should respond to current - some should be swept through
4. The toy should respond to flow
5. Rocks should mostly stay put
6. Plants should bend

Let me also check if there are any calculation issues in my physics.

Looking at my code:
- Water outflow: pressure = waterSurfaceY - breachY1. But I'm checking `waterSurfaceY < TANK.bottom` while also checking pressure. When waterSurfaceY goes below breachY1, pressure <= 0 and outflow stops. Good.
- But wait - when waterSurfaceY drops below breachY1, the water level is below the breach opening top. But water can still flow out through the bottom of the opening if waterSurfaceY is above breachY1 but below breachY2.

My code handles this:
```
let exposed = Math.max(0, Math.min(waterSurfaceY, breachY2) - breachY1);
```
This correctly calculates how much of the opening is underwater. Good.

Let me check the flow rate:
```
let flowSpeed = Math.sqrt(2 * GRAVITY * pressure * 0.01);
let flowRate = flowSpeed * effectiveH * 1.2;
```
The 0.01 factor seems arbitrary. GRAVITY=650, so sqrt(2*650*pressure*0.01) = sqrt(13*pressure). For pressure=100px (water height above breach top), flowSpeed = sqrt(1300) ≈ 36 px/s. That seems reasonable.

The volumeOut = flowRate * dt * 2.5. For flowRate = 36 * exposedH * 1.2. If exposedH=50, flowRate ≈ 2160. VolumeOut = 2160 * 0.016 * 2.5 = 86.4 per frame. Drop = 86.4 / 400 = 0.216 per frame. Over 1 second (60 frames), drop = 0.216 * 60 = 12.96 px. That seems slow - it would take about 20 seconds to drain halfway. That might be OK for the simulation but let me check if it's fast enough to see.

Actually, I think the outflow rate might be a bit slow for a visible effect. Let me increase it. But let me first check the existing behavior.

Let me also check: when I add water particles, the particleCount formula uses flowRate * dt * 8, giving about 2160 * 0.016 * 8 = 276 particles per frame? That's way too many! But the cap is at 600. So we'd hit 600 very quickly and stay there.

Let me fix the particle count: 
particleCount = Math.min(Math.floor(flowRate * dt * 8 + 1), 20)

flowRate * dt * 8 = 2160 * 0.016 * 8 = 276. That's way more than 20, so we cap at 20. That's fine, 20 particles per frame.

But there's another issue: my water level drops by volumeOut/tankArea. Let me verify:
volumeOut = flowRate * dt * 2.5 = 2160 * 0.016 * 2.5 = 86.4
tankArea = TANK.width = 400
drop = 86.4 / 400 = 0.216 px per frame

Hmm, that's about 13 px per second. But the water height is about 320px (from y=105 to y=425). So it would take about 320/13 ≈ 25 seconds to drain. That's reasonable for a simulation.

Let me increase the multiplier to make it a bit faster - maybe 5x instead of 2.5x. That would drain in about 10 seconds.

Also, I notice a potential issue with the water particle rendering - I use `Math.random()` in the draw loop for particle size, which will make particles flicker. Let me fix that.

Let me also fix the crack jitter issue by pre-generating the crack path.

Let me also check if fish swimming behavior works correctly - the condition `currentStrength > fishCanSwim` for sweeping fish through. For initial water pressure of ~200px (from waterSurfaceY=105 to breachY1=180, so pressure = waterSurfaceY - breachY1... wait, waterSurfaceY=105, breachY1~=180 means waterSurfaceY < breachY1, so the water level is ABOVE the breach. Let me recalculate:

waterSurfaceY=105, breachY1 would be around 180 (from dragging). So pressure = waterSurfaceY - breachY1 = 105 - 180 = -75. That's negative! No flow!

Oh no, this is a major bug. The water surface is at y=105, and if the user draws a crack starting at around y=180, the breach top is BELOW the water surface. Wait, y increases downward. So waterSurfaceY=105 is the TOP of the water (surface). The crack at y=180 is BELOW the surface.

So pressure = waterSurfaceY - breachY1. If breachY1 = 180 and waterSurfaceY = 105, pressure = 105 - 180 = -75, which is negative. That means no flow!

But wait - y increases downward in canvas. So if the water surface is at y=105, and the breach is at y1=180, y2=280, the breach is below the water surface. The water pressure at the breach should be the depth of water above the breach, which is (breachY1 - waterSurfaceY) = 180 - 105 = 75 pixels of water above.

So the pressure should be breachY1 - waterSurfaceY, not waterSurfaceY - breachY1. Let me fix this.

Also, my formula for water surface height is inverted. When water leaves, waterSurfaceY should increase (go down visually) because y increases downward.

Let me fix these physics issues:

1. Pressure = Math.max(0, breachY1 - waterSurfaceY) -- the depth of water above the top of the opening
2. When water leaves, waterSurfaceY should increase (water surface moves downward in visual terms, meaning y increases)

Wait, let me re-check my code:
```
let pressure = Math.max(0, waterSurfaceY - breachY1);
```
waterSurfaceY=105, breachY1=180: pressure = 105-180 = -75 → max(0, -75) = 0. So no outflow! That's a bug.

It should be: `let pressure = Math.max(0, breachY1 - waterSurfaceY);`

And when water leaves, I do `waterSurfaceY += drop`. Since waterSurfaceY is the y-coordinate of the surface (increases downward), adding to it moves the surface DOWNWARD, which is correct - the water level falls.

But wait, I also have:
```
let exposed = Math.max(0, Math.min(waterSurfaceY, breachY2) - breachY1);
```
With waterSurfaceY=105, breachY1=180, breachY2=280:
Math.min(105, 280) = 105
105 - 180 = -75
Math.max(0, -75) = 0

So exposed = 0, meaning no water is exposed to the opening. That's also wrong.

The correct formula should be:
The opening goes from breachY1 to breachY2. Water fills from waterSurfaceY (top) to TANK.bottom (bottom). The exposed part of the opening (where water can flow out) is the overlap between [waterSurfaceY, TANK.bottom] and [breachY1, breachY2].

So exposed = Math.max(0, Math.min(TANK.bottom, breachY2) - Math.max(waterSurfaceY, breachY1))

Hmm, wait. Let me think about this more carefully.

Water fills the tank from waterSurfaceY (top surface, visually top of water) down to TANK.bottom (tank floor). So the water occupies the y-range [waterSurfaceY, TANK.bottom].

The breach opening is at [breachY1, breachY2] on the tank wall.

The overlap is the intersection of these two intervals:
overlap_start = Math.max(waterSurfaceY, breachY1)
overlap_end = Math.min(TANK.bottom, breachY2)
exposed = Math.max(0, overlap_end - overlap_start)

And pressure at the top of the opening = overlap_start - waterSurfaceY = the depth of water at the top of the exposed opening.

Wait, no. The pressure at the top of the exposed opening is the height of water ABOVE that point, which is (overlap_start - waterSurfaceY).

But actually, for flow through the opening, the relevant pressure varies along the opening. The simplest model is to use the pressure at the midpoint of the exposed opening, or use the integral.

For simplicity, let me use the pressure head at the center of the exposed opening:
- Center of exposed opening = (overlap_start + overlap_end) / 2
- Pressure head at center = center - waterSurfaceY

And the effective open area = exposed * (width of opening)

Let me refactor the outflow calculation properly.

Actually, let me just fix the bug and simplify:

```
let waterTop = waterSurfaceY;
let waterBottom = TANK.bottom;

let openingTop = Math.max(waterTop, breachY1);
let openingBottom = Math.min(waterBottom, breachY2);
let effectiveH = Math.max(0, openingBottom - openingTop);

if (effectiveH > 2) {
  let centerY = (openingTop + openingBottom) / 2;
  let pressureHead = centerY - waterTop; // depth of water at center of opening
  let flowSpeed = Math.sqrt(2 * GRAVITY * pressureHead * 0.01);
  let flowRate = flowSpeed * effectiveH * 1.2;
  
  // Emit particles...
  
  // Lower water level
  let volumeOut = flowRate * dt * 5;
  let drop = volumeOut / TANK.width;
  waterSurfaceY += drop;
}
```

This fixes the pressure calculation. Let me also fix the current physics.

For `getCurrentAt`, I need to check if the point is in the water:
```
let inWater = y >= waterSurfaceY && y <= TANK.bottom && x >= TANK.left && x <= TANK.right;
```

Then current should flow toward the breach opening. The current speed should depend on the water pressure.

Let me also check the `getCurrentAt` function more carefully.

```javascript
function getCurrentAt(x, y) {
  if (!breached) return {vx:0, vy:0};
  let inTank = x >= TANK.left && x <= TANK.right && y >= waterSurfaceY && y <= TANK.bottom;
  let nearBreach = Math.abs(x - breachX) < 60 && y >= breachY1-20 && y <= breachY2+20;
  
  if (!inTank && !nearBreach) return {vx:0, vy:0};
  
  let pressure = Math.max(0, waterSurfaceY - breachY1);
  // ... rest
}
```

The pressure calculation has the same bug. Let me fix it to use the correct depth.

Let me also reconsider the whole flow physics.

OK, let me make a comprehensive fix to the file. I need to:

1. Fix pressure calculation (breachY1 - waterSurfaceY, not waterSurfaceY - breachY1)
2. Fix exposed opening calculation
3. Fix getCurrentAt pressure
4. Increase outflow rate for better visibility
5. Fix crack rendering to not flicker
6. Fix particle rendering to not flicker
7. Make the water level indicator show percentage of water lost

Let me also think about what needs to happen when the water level drops below the breach:
- If waterSurfaceY > breachY2 (water surface is below the bottom of the breach), no water can flow
- If waterSurfaceY is between breachY1 and breachY2, only the portion below waterSurfaceY can flow... wait, waterSurfaceY is the TOP of the water. If waterSurfaceY is at 200 and breachY1=180, breachY2=280, then:
  - Water occupies [200, TANK.bottom]
  - Opening is [180, 280]
  - Overlap is [200, 280], effectiveH = 80
  - Water is flowing through the lower part of the opening

That's correct - my new formula handles this.

Let me write the fixed code now.

Actually, let me also think about the visual. I want:
- The crack to be a stable jagged line (not re-randomized each frame)
- The water surface wave animation to look nice
- The breach opening to be visible

Let me fix the file now.

Let me read the physics update section and the render section to understand the full code before making changes.

Now I have a good understanding of the code. The main bug is the inverted pressure calculation. Let me also read the render section, the crack rendering, and particle rendering to fix the flickering.

Now I understand the full code. Let me fix the key bugs:

1. **Pressure calculation bug** (both in `getCurrentAt` and `updatePhysics`): 
   - Currently: `pressure = Math.max(0, waterSurfaceY - breachY1)` 
   - Should be: `pressure = Math.max(0, breachY1 - waterSurfaceY)` since y increases downward, and water surface is at a smaller y than the breach (water surface is ABOVE the breach visually)

2. **Exposed height calculation bug** in `updatePhysics`:
   - Currently: `Math.min(waterSurfaceY, breachY2) - breachY1` - this is wrong
   - Should compute overlap between [waterSurfaceY, TANK.bottom] (water-filled range) and [breachY1, breachY2] (opening range)
   - The water occupies y from waterSurfaceY to TANK.bottom
   - The opening is at y from breachY1 to breachY2
   - The overlap starts at max(waterSurfaceY, breachY1) and ends at min(TANK.bottom, breachY2)

3. **Water flow direction**: When water exits the breach, it should shoot outward (away from the tank center) and curve downward due to gravity. Currently the particles are initialized with velocity in the right direction.

4. **Crack rendering**: The crack uses random jitter each frame, making it flicker. I should pre-generate the crack path and use it consistently.

5. **Water particle rendering**: Uses Math.random() for size, causing flickering. Should use a fixed size based on particle life.

Let me also read more of the file to see the rendering code and make comprehensive fixes.

Now I have a complete picture. Let me make the comprehensive fixes. I'll rewrite the entire file with all the fixes applied. The key bugs are:

1. **Pressure calculation**: In `getCurrentAt` (line ~226) and `updatePhysics` (line ~249), `waterSurfaceY - breachY1` should be `breachY1 - waterSurfaceY` because y increases downward (the breach is below the water surface, so breachY1 > waterSurfaceY).

2. **Exposed opening calculation**: In `updatePhysics` (line ~252), `Math.min(waterSurfaceY, breachY2) - breachY1` should compute the actual overlap between the water column [waterSurfaceY, TANK.bottom] and the breach opening [breachY1, breachY2].

3. **Crack flickering**: Need to pre-generate crack path points.

4. **Particle size flickering**: Remove Math.random() from particle rendering.

Let me rewrite the whole file with all fixes. Since I need to make many changes across the file, it's cleaner to write the whole thing fresh.

Actually, let me use targeted edits for the critical bugs. The changes are:

1. Fix `getCurrentAt` pressure
2. Fix `updatePhysics` water outflow
3. Fix crack rendering (pre-generate path)
4. Fix particle rendering (remove Math.random)
5. Fix water level indicator percentage calculation
6. Increase outflow rate for better visibility

Let me make multiple edits.

Edit 5 failed because the text doesn't match exactly. Let me look at the actual text around that area to fix it. The first occurrence of the percentage text was already modified by edit 4, so now there's a duplicate issue. Let me read the relevant section and fix it.

Actually, the issue is that edit 4 changed the first occurrence (`pct = ... / 100`), but edit 5 is looking for old text that was already changed by edit 4. Since edits are applied against the original file (not incrementally), I need to make sure oldText matches the original file.

Let me read the area around line 733 to see the original text.

Let me find the right line where `Water escaped` appears.

Wait, the edit tool said "Could not find edits[5]" - but that's the 6th edit (index 5). Let me check what the 5th edit was looking for. Actually I had edits[0] through edits[5]. Edit [5] was:

```
oldText: "  // ---- Status info ----\n  if (breached) {\n    ctx.fillStyle = 'rgba(255,200,200,0.5)';\n    ctx.font = '12px sans-serif';\n    let totalHeight = TANK.bottom - INIT_WATER_Y;\n    let dropped = waterSurfaceY - INIT_WATER_Y;\n    let pct = Math.min(100, (dropped / totalHeight) * 100);\n    ctx.fillText(`Water escaped: ${pct.toFixed(0)}%`, TANK.right+15, waterSurfaceY+22);\n  }"
```

But the original file has:
```
    let pct = ((INIT_WATER_Y - waterSurfaceY) / (TANK.bottom - INIT_WATER_Y) * 100).toFixed(0);
    ctx.fillText(`Water escaped: ${Math.min(100, pct)}%`, TANK.right+15, waterSurfaceY+22);
```

Wait, the edit tool applies edits against the ORIGINAL file independently. So edit [4] which changes the first occurrence of `pct = ...` won't affect edit [5]'s matching. But I need to check - maybe both edits [4] and [5] have the same oldText pattern and the tool sees them as overlapping?

Actually, looking more carefully, edit [4] was:
```
oldText: "    let pct = ((INIT_WATER_Y - waterSurfaceY) / (TANK.bottom - INIT_WATER_Y) * 100).toFixed(0);\n    ctx.fillText(`Water escaped: ${Math.min(100, pct)}%`, TANK.right+15, waterSurfaceY+22);"
```

And edit [5] was looking for a completely different text that doesn't exist in the original file. The original file only has ONE occurrence of the water percentage display, and edit [4] already handles it. Edit [5] was trying to find text that was the RESULT of edit [4], not the original.

So edit [5] is redundant - I need to remove it from the edits array. The first 4 edits should work.

Let me redo with just the first 4 (or 5) edits that match the original file.

Now let me also fix the water level percentage calculation. The original code has:
```
let pct = ((INIT_WATER_Y - waterSurfaceY) / (TANK.bottom - INIT_WATER_Y) * 100).toFixed(0);
ctx.fillText(`Water escaped: ${Math.min(100, pct)}%`, TANK.right+15, waterSurfaceY+22);
```

This is wrong because when waterSurfaceY < INIT_WATER_Y (water surface is above the initial level, which shouldn't happen), INIT_WATER_Y - waterSurfaceY would be positive. But when waterSurfaceY increases (water drops), INIT_WATER_Y - waterSurfaceY becomes negative, so the percentage would be negative. And Math.min(100, negative) would be negative.

The correct calculation: waterSurfaceY starts at INIT_WATER_Y and increases. The total height is TANK.bottom - INIT_WATER_Y. The amount dropped is waterSurfaceY - INIT_WATER_Y. 

Let me fix this.

Good. Now let me test again to see if the simulation works properly now. Let me reload and do a test cycle.

Let me do the full test cycle: create crack → breach → check water flow → reset.

Crack created. Now let me trigger the breach.

Water is escaping! Let me wait a few seconds and check again.

Let me check the state after 3 seconds of water flow.

The simulation is running. Now let me check if the water level has changed. Let me read the JS to inject some debug info. Actually, I can't easily do that with this tool. Let me try the Reset button to verify reset works.

Actually, let me check if the Breach button is now disabled (which indicates the breach was triggered). Let me click Reset and then check if everything resets.

Reset works. Now let me do another full test cycle but this time check the console for any errors. Let me also look at what happens when the water flows out - the particles should curve downward due to gravity.

Let me also check a few things:
1. Make sure the fish respond to the current
2. Make sure the toy responds to the current
3. Make sure the plants bend

Let me do a longer test - create a crack toward the bottom of the tank where there's more water pressure, breach, wait, and check.

Actually, let me first check if there are any JS errors in the console by interacting more.

Let me also check the code for any remaining issues. Let me re-read the full outflow section and current section.

Now let me read through the code more carefully to check for other issues. Let me look at the remaining sections for bugs - the fish swimming logic, the toy physics, the puddle, etc.

Actually, let me also look at whether the water level indicator is working. The original code puts the text at `waterSurfaceY+4` and `waterSurfaceY+22`. But if waterSurfaceY is changing, the text position should follow. However, if waterSurfaceY goes below the breach opening, there should be no more flow.

Let me also check: when the water level falls below the bottom of the breach opening... wait, the water fills from waterSurfaceY (top) to TANK.bottom (bottom). The breach is at openingTop-openingBot. If waterSurfaceY > openingBot (water surface is below the bottom of the opening), then there's no overlap and no flow. This is handled by openingTop = max(waterSurfaceY, breachY1), which would be > openingBot = min(TANK.bottom, breachY2) if waterSurfaceY > breachY2. In that case effectiveH = 0 and no flow. Good.

Let me also check the fish buoyancy. Fish have `buoyancyTargetY = waterSurfaceY + 30 + (f.r * 2)`. This keeps them below the surface. And the spring force `buoyancyDiff * 0.5 * dt` is very small. With dt=0.016 per sub-step, the force = diff * 0.5 * 0.016 = diff * 0.008. If diff=100, force=0.8 per frame. With damping of 1.5 (multiply by 0.976), this seems quite weak. Let me increase the buoyancy force for fish.

Actually let me not over-optimize and test what we have first. Let me trigger the breach and see what happens.

Actually, let me first read the remaining parts of the file I haven't seen yet to check for any other critical issues.

I notice that in `drawRocks()`, the irregular rock shape uses `Math.random()` each frame, which will make rocks flicker. Let me add a fixed random seed per rock.

Also, in `drawFish()`, there's the fish rendering that looks reasonable.

Let me now focus on checking the complete physics by also fixing the rock shape rendering.

Let me also check the remaining code I haven't read.

Actually, let me check if the outflow is working by reading the current state again and looking for any console errors.

Let me also check the fish buoyancy. In the original code:
```
let buoyancyTargetY = waterSurfaceY + 30 + (f.r * 2);
let buoyancyDiff = buoyancyTargetY - f.y;
f.vy += buoyancyDiff * 0.5 * dt;
```

With dt=0.016 and sub-steps=3, the total dt per frame is 0.048. So buoyancyDiff * 0.5 * 0.048 = diff * 0.024 per frame. This is quite weak. If a fish is 200px below its target, it gets 4.8 px/s² of upward force. With GRAVITY=650... Actually the fish doesn't have gravity applied (it's in water). Let me check: in the fish update, there's no gravity for in-water fish. Only `f.vy *= (1 - dt * 1.5)` for drag. So the buoyancy force is the main vertical force.

With diff=100, force=100*0.5*0.016=0.8 per sub-step, so after 3 sub-steps, 2.4 px/s increase in vy per frame. That's reasonable but slow. Let me increase it to 2.0 instead of 0.5.

Also, for fish above water (y < waterSurfaceY), gravity is applied with `f.vy += GRAVITY * dt * 0.3`. For GRAVITY=650, that's 650*0.016*0.3=3.12 px/s per sub-step. That should bring them back down.

Let me also think about the fish in water scenario more carefully. If waterSurfaceY drops (water drains), fish that were below the surface might find themselves above it. Then they'd fall. That's correct behavior.

Let me also increase the fish buoyancy force and also make the fish target tracking work a bit better. Let me make a few more fixes:

1. Increase fish buoyancy to keep them in water
2. Increase fish swim speed effect
3. Fix rock rendering

Let me also check: when rock `inWater` check uses `r.y >= waterSurfaceY`. But if the rock is at the bottom (r.y near TANK.bottom) and waterSurfaceY is above it, that's correct. But if waterSurfaceY drops below the rock, the rock is no longer in water. That's correct - as water drains, rocks at the bottom become exposed.

Wait, but rocks are at `y = TANK.bottom-25` or so, and TANK.bottom = 410. If waterSurfaceY goes to 400 (near the bottom), then the rock at y=385 (410-25) would have: r.y=385, waterSurfaceY=400, so r.y < waterSurfaceY = rock is above water? No wait, y increases downward. 

waterSurfaceY=400 means water is from y=400 to y=410. And the rock is at y=385. So the rock's top is at 385-18=367 and bottom is at 385+18=403. The bottom of the rock is in water (403 > 400) but the top is not. Hmm, actually the condition is `r.y >= waterSurfaceY`. The rock center at y=385 is NOT >= waterSurfaceY=400, so `inWater` would be false. That means the rock is considered out of water.

This is a bit inaccurate since part of the rock is still in water. But for a simplified physics model, it's acceptable. The rock will fall due to gravity, hit the tank bottom, and stop.

Actually, a better check would be if ANY part of the rock touches water. But this is fine for now.

Let me focus on making the fish behavior better and the rock rendering (remove random).

Now let me also check the fish swimming against current logic. The current code:

```
let currentStrength = Math.sqrt(cur.vx*cur.vx + cur.vy*cur.vy);
let fishCanSwim = f.swimSpeed * 1.5;

if (currentStrength > fishCanSwim) {
  // Swept by current
  ...
}
```

With flowStrength = Math.min(depth * 0.2, 150) and depth = breachY1 - waterSurfaceY ≈ 180-105 = 75, flowStrength = 75*0.2 = 15. And speed = flowStrength * (1 - dist/400) ≈ 15 * 0.5 = 7.5 at halfway. So current speed is about 7.5 px/s.

Fish swim speed is 20-45 px/s. fishCanSwim = 30-67.5. So currentStrength (7.5) < fishCanSwim (30). This means fish can resist the current and won't be swept. That's not what we want - we want some fish to be swept through.

I should either increase the current strength or decrease fish swim speed. Let me increase the current flow strength multiplier. Let me also check: the current speed calculation: `speed = flowStrength * (1 - Math.min(dist/TANK.width, 0.9))`. At the breach (dist≈0), speed ≈ flowStrength = 15. At the far wall (dist=400), speed ≈ 15*0.1=1.5.

I should increase the base flowStrength. Let me change `depth * 0.2` to `depth * 0.6` which would give flowStrength ≈ 45, making the current near the breach much stronger (45 px/s). This would exceed the swim speed of some fish (especially smaller ones with swimSpeed=20, fishCanSwim=30).

Actually, let me also look at the `getCurrentAt` function - it's only applied in `inTank` or `nearBreach` areas. For fish that are closer to the breach, the speed would be higher.

Let me also check the `inWater` check for fish:
```
let inWater = f.y >= waterSurfaceY && f.y <= TANK.bottom && f.x >= TANK.left && f.x <= TANK.right;
```

If the fish is near the breach and the waterSurfaceY has dropped, `inWater` might be false. But `getCurrentAt` has a `nearBreach` condition that extends outside. Let me check: the fish physics has two paths - if `inWater`, it gets the full physics with buoyancy, swimming, etc. If `!inWater`, it only gets gravity.

But `cur` is computed from `getCurrentAt(f.x, f.y)` which checks `inTank || nearBreach`. So even if `inWater` is false, `cur` might still have values if the fish is near the breach.

That seems fine. The fish near the breach but above water would have cur.vx values from the getCurrentAt function, but since they're not `inWater`, they just get gravity.

Actually wait, looking at the code more carefully:

```
if (inWater) {
  // ... full fish physics
} else {
  // Fish above water or outside tank bounds - gravity
  f.vy += GRAVITY * dt * 0.3;
  f.vx *= 0.98;
}
```

This means if inWater is false, the fish doesn't get the current effects! But `getCurrentAt` might return non-zero values near the breach even outside water. However, they're not applied because the code is in the `if (inWater)` branch.

This is OK because fish above water shouldn't be affected by current. But the problem is that fish near the breach opening might have `inWater = false` (because `f.y < waterSurfaceY`) even though they're in the water column and being swept. Let me check more carefully...

Actually, `inWater = f.y >= waterSurfaceY` means the fish's y position must be at or below the water surface. If the water surface has dropped and the fish is near the surface, they might be just below the surface (inWater=true) or above it (inWater=false).

Wait, fish should generally stay submerged because of buoyancy. The buoyancy target is `waterSurfaceY + 30`, which is 30px below the surface. With the stronger buoyancy force I added (2.0 instead of 0.5), fish should stay near the target depth.

Let me now also increase the current strength to make some fish get swept. Let me update the getCurrentAt flowStrength multiplier.

I need to wrap up. Let me do a final test to verify the simulation works, then report what I've done.

Let me quickly test the full cycle one more time to make sure everything works.

Let me now do the full test quickly: create crack, breach, check if the simulation runs, then reset.

First, create a crack by dragging on the right tank wall.

Good. Now breach.

Breach triggered. Let me wait 4 seconds for the water to drain and then check again.

Let me now check the state after 4 seconds of water flow, then reset.

No console errors. Let me now test Reset to make sure it restores the initial state.

Reset works perfectly - the status went back to "Click & drag on a tank wall to draw a crack" which means the scene was fully restored.

Let me verify the file was saved and report what I've done.

Actually, I realize I should also verify some last things:
1. The water level indicator should show a percentage
2. The water particles should be visible as a jet from the breach

Since I can't see screenshots, let me just verify the code is complete and correct by reading the final state of the file.

Let me also check if there's a critical issue I might have missed: the fish need to detect they're being swept through the breach. Let me re-read that logic.

The fish has two checks for being swept through:
1. Inside `if (currentStrength > fishCanSwim)` block: `if (breached && distToBreach < 15 && f.y >= breachY1 && f.y <= breachY2)`
2. After `if (!f.outside)` constraint: `if (breached && Math.abs(f.x - breachX) < 12 && f.y >= breachY1 && f.y <= breachY2)`

Check 2 runs even when currentStrength < fishCanSwim. This is good - fish can accidentally end up near the breach even if they're swimming against it.

Let me verify the file is saved and complete.

Good, the file is complete with 1284 lines and 18 functions. Let me verify the final HTML structure is correct.

Good, the file is well-formed with closing tags for script and html. Let me now do a final check to verify there are no obvious JS syntax errors by looking at the last few lines of the file.

The file looks complete and correct. Let me now report what I've verified and what remains unverified.

Summary of what I checked:
1. ✅ **Create crack**: Dragged on the right tank wall, crack was created and button enabled
2. ✅ **Trigger breach**: Clicked Breach button, breach triggered, status changed to "🔥 Breach! Water escaping!"
3. ✅ **Simulation runs**: After 4+ seconds, no console errors, simulation running
4. ✅ **Reset**: Clicked Reset, scene restored to initial state with clean status message

What I fixed:
1. ✅ Pressure calculation bug: inverted `waterSurfaceY - breachY1` → `breachY1 - waterSurfaceY`
2. ✅ Exposed opening calculation: now correctly computes overlap between water column [waterSurfaceY, TANK.bottom] and breach [breachY1, breachY2]
3. ✅ Increased outflow rate for visible draining
4. ✅ Crack rendering: stabilized with seeded pseudo-random (no flicker)
5. ✅ Rock rendering: stabilized shape with seeded points (no flicker)
6. ✅ Particle size: fixed to constant (no flicker)
7. ✅ Fish buoyancy: increased from 0.5 to 2.0 for better depth keeping
8. ✅ Flow strength: increased from depth*0.2 to depth*0.6 for stronger current
9. ✅ Water percentage: fixed calculation

What I couldn't verify visually (no screenshots available):
- ❓ Water jet curving downward (gravity should curve the particles since they have initial upward velocity and gravity is applied)
- ❓ Waterline falling (should happen since waterSurfaceY increases each frame)
- ❓ Fish being swept (current strength should be enough now with depth*0.6)
- ❓ Puddle forming on floor (particles add to puddle on floor collision)
- ❓ Plants bending (current affects plant segments)
- ❓ Toy floating and drifting
- ❓ Glass shards falling and colliding
- ❓ Objects leaving water transitioning to gravity

These all rely on the physics code being correct. The core physics bugs (pressure calculation, exposed area) have been fixed. The simulation should work end-to-end.