Chapter 4 · Try it yourself

Depth Dial

Take a dive. As you go deeper, seawater soaks up sunlight one color at a time. Watch what happens to the red fish, the orange coral, and everything else on the reef.

Use the arrow keys or drag. Page Up and Page Down jump faster.

A reef scene at the surface in full color.

You are at
the surface

Light left at this depth

    Simplified model for clear tropical water. Real water varies: murky coastal water loses its light much faster.