1The deep ocean covers most of our planet, yet we know less about it than the Moon.
2Sunlight only reaches the upper two hundred metres of the sea, and below that lies total darkness.
3In this cold, black world, the pressure is hundreds of times greater than at the surface.
4Strange creatures live down here, and many of them produce their own glowing light in the darkness.
5The anglerfish uses a glowing lure to attract smaller fish directly towards its sharp teeth.
6Giant squid, with eyes the size of dinner plates, hunt quietly through the midnight zone.
7Near underwater volcanoes, entire communities of strange deep-sea creatures survive without any sunlight at all.
8Tiny bacteria in these dark places use chemicals instead of sunlight to make their energy.
9Scientists explore these extreme depths in small submarines that are built to withstand the enormous pressure.
10Every expedition into the deep discovers new species that no human being has ever seen before.
11The deep ocean reminds us how much of our own planet still remains a mystery.