Descent
A slow fall through eleven kilometers of water.
Epipelagic / 0 to 200 m
The sunlight zone hums with green light.
Here the water is still a window. Light pours in from above and feeds drifting fields of phytoplankton that breathe out half the oxygen on Earth. Turtles cruise through the haze and silver schools turn as one, flashing like coins dropped in a fountain. Every ten meters, another atmosphere presses down.
Mesopelagic / 200 to 1,000 m
Twilight, where blue goes to fade.
The last thin blue thread of sunlight dissolves. Lanternfish wear rows of light along their bellies to erase their own shadows. Every night, the largest migration on the planet rises from here to the surface to feed, and every dawn it sinks back into the gloom. It happens without a single witness.
Bathypelagic / 1,000 to 4,000 m
Midnight. The only light is alive.
No sun has ever touched these waters. Ninety percent of the creatures here make their own light, blinking, luring, warning. An anglerfish dangles a lamp from her forehead and waits for something curious enough to come close. Darkness, here, is the native language.
Abyssopelagic / 4,000 to 6,000 m
The abyss is a plain of slow snow.
A gentle blizzard of marine snow, the remains of everything above, falls for weeks before it lands. On soft silt plains, tripod fish stand on three stilt-like fins, facing the current, waiting for a meal to drift into reach. The water is near freezing and almost perfectly still.
Hadalpelagic / 6,000 to 10,935 m
The trenches, named for the underworld.
The seafloor splits open into canyons deep enough to swallow mountains. Pale amphipods scavenge the walls, their shells hardened by aluminum pulled from the water itself. The weight above you is like an elephant standing on your thumbnail. Fewer people have been here than to the Moon.
Challenger Deep / 10,935 m
You have reached the bottom of the world.
A ribbon of sediment, a single drifting particle, the hum of your own heartbeat. It took you minutes. The sunlight above will never make the trip. Take a breath before the long climb home.