0 m
Sea level
You're floating. The sun is warm. Scroll down.
10 m
Snorkeling depth
Most snorkelers stay above here. You can still see your feet.
30 m
Recreational dive limit
Past this, scuba divers need special training.
100 m
Blue whale
The largest animal that ever lived dives to about 100m to feed.
214 m
Free dive record
Herbert Nitsch reached 214m holding one breath. He blacked out on the way up.
332 m
Deepest scuba dive
Ahmed Gabr, 2014. It took him 12 minutes to go down and 14 hours to come up.
500 m
Twilight zone ends
Below here, no sunlight reaches. Ever.
1,000 m
Giant squid
Eyes the size of dinner plates. We didn't film one alive until 2012.
2,000 m
Sperm whale
Hunts giant squid down here. Holds its breath for 90 minutes.
3,800 m
Titanic
Resting on the seafloor since 1912. Slowly being eaten by bacteria.
6,000 m
Abyssal plain
Vast, flat, almost lifeless. Covers half the Earth's surface.
8,848 m
Mount Everest, upside down
If you flipped Everest into the ocean, you'd still have water above its peak.
10,898 m
James Cameron
Descended solo to near the bottom in 2012 in a custom submersible.
10,935 m
Challenger Deep
The deepest known point on Earth. Pressure: 1,086 bar. You would be a paste.