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It's hard to say which is more remarkable to scientists studying this bizarre world thousands of feet beneath the sea: what these animals have to cope with, or what they have come up with to do ...

In this video, we dive into the abyss to find out why animals down there look so alien, how they survive in complete darkness, and why the deep sea is home to some of the most nightmarish life ...

Living in the dark at crushing depths, the animals below are rarely seen by ... and Exploration in the Abyss (Knopf, 1996). Click on any of the pictures below to see the full view.