Scroll down through the ocean. One pixel is two metres. Everything here comes from a documentary I watched, Into the Abyss: Creatures of the Midwater, so where it gave a depth I used it, and where it gave only a zone, so did I.
Floats on a gas-filled bladder, sails on the wind, and hangs its stinging tentacles down into the water.
Microscopic producers turning sunlight, water and carbon dioxide into oxygen and sugar. More than 90% of all marine life lives up here.
A body a few millimetres thick, almost invisible head-on, with lights along its belly that match the faint glow from above, so it vanishes from below too.
A colony of cloned parts living as one animal, possibly the longest animal ever observed: around 150 metres, longer than a blue whale. Colonies keep cloning themselves and can be effectively immortal.
About 40 cm long and almost entirely see-through. Its eyes are one of the few things you can see inside it.
The largest migration on Earth: animals rise to feed at the surface each night and sink back at dawn. Navy sonar in the Second World War first picked it up as a false sea floor, far too shallow to be real. Lanternfish, the most abundant vertebrates on the planet, are part of it.
So deep that the sun, the waves and the tides aren't felt. The film says this habitat has barely changed in millions of years.
Pressure rises by one atmosphere for every ten metres. Here, at about a kilometre, it's around a hundred times what you feel at the surface. Soft, watery bodies cope because water can't be squeezed.
Shines red searchlights from under its eyes. Most animals down here can't see red, and red-coloured prey that normally look black suddenly stick out in its light.
Carries more than 2,000 eggs in a sac over twice her length, clinging to them with hooked arms for up to nine months.
Lives for centuries and grows up to seven metres, longer than a great white. Down here, the slow and patient grow old.
Fishes the falling "marine snow", scraps from the feasts above, with a long sticky filament, in water too short of oxygen for most competitors.
Flaps two ear-like fins to glide through the dark. The deepest-living octopus known, at pressures around six hundred times the surface.
A sea cucumber that swims, the link between the midnight water and the sea floor. Its relatives feed on marine snow, and jellyfish alone may lock about two billion tonnes of carbon away in the deep.
A great desert of soft mud, worked by burrowers, crossed by scavengers gathering at the bones of giants. The deep-sea plains cover more than half of Earth's surface.