The Descent
From the sunlit surface to the bottom of the Mariana Trench. Scroll down and watch how light, pressure, temperature and life change with every metre.
↓ Scroll down — you are sinking
The Surface
The descent begins. Sunlight floods the water, oxygen is abundant, and almost all life of the open ocean crowds into this thin, warm skin.
Still in the Light
Silver schools drift through the blue. A recreational diver turned back long ago — the recommended limit is 40 metres, a hundred metres above you.
Into the Twilight
At 200 metres the sunlight zone ends: only about one percent of surface light reaches here. Hatchetfish stare up into the last glimmer with tubular, skyward eyes.
The False Seafloor
Home to Earth's largest animal migration: every night lanternfish and krill rise to feed and sink back at dawn. Wartime sonar mistook their echo for the seafloor itself.
Where Oxygen Runs Low
In the oxygen minimum zone, oxygen drops to a fraction of surface levels. The vampire squid, a living fossil, thrives precisely here — and ejects a shower of bioluminescent sparks instead of ink.
Eternal Night
Below 1000 metres no sunbeam ever reaches. The only light is the one life makes itself: the anglerfish lures with a blue-green glowing rod, fed by symbiotic bacteria.
The Deepest Breath
This deep a sperm whale dives on a single breath to hunt squid. Almost no other air-breathing animal pushes so far into the black.
The Titanic
In eternal cold and darkness rests the wreck of the Titanic. The pressure here is some four hundred times that at the surface — as if a small car rested on every thumbnail.
The Abyssal Plain
A vast, near-freezing plain at about 2 °C. From above drifts endless 'marine snow' — the remains of surface life that feed sea cucumbers and tripod fish down here.
Into the Trenches
Below 6000 metres begins the hadal zone, named after Hades, the underworld. Only the deep trenches reach here; on their walls, swarms of pale amphipods gather at carrion.
The Deepest Fish
At 8336 metres a snailfish was filmed in 2022 — the deepest fish ever observed, translucent and gelatinous. Deeper than this, a fish can barely exist by current understanding.
The Bottom
The Challenger Deep, the deepest known point on Earth, about 10,935 metres. Pressure exceeds 1000 bar — as if the weight of some 50 jumbo jets rested on a single person.
Over 90% of Earth's living space lies underwater — and most of it in eternal darkness, under a pressure that would crush us. We know the surface of the Moon better than this floor.
Values are continuous approximations after published oceanographic data (pressure ~1 bar/10 m; euphotic boundary ~200 m; deep-sea temperature ~2 °C; oxygen minimum zone ~200–1000 m; bioluminescence after Martini & Haddock 2017; Challenger Deep ~10,935 m, Greenaway et al. 2021). An illustration, not a local measurement.