Epipelagic
Sunlight zone
Enough light for photosynthesis. Almost every fish you can name lives in this thin band.
0m
Below surface
Pressure
1atm
Temperature
22.0°C
Surface light
Flooding ballast
Reached
10,994 metres. The bottom of the world.
More people have been to the Moon than to the Challenger Deep. Every depth on the way down is real — the Titanic really is at 3,800 m, and a sperm whale really does hunt at 1,200 m on a single breath.