A CENTURY AGO, SCIENTISTS BELIEVED THAT NO LIFE COULD EXIST in the very deep oceans. Now we know that creatures do survive there, but conditions are very harsh. 3,330 feet (one thousand meters) below the sunlit surface, the water is pitch-black and very cold. Deep-sea fish must be able to stand the great pressure caused by the weight of water on top of them, which could kill surface creatures. Many deep-sea fish look like monsters from a horror film, with large heads, huge mouths with fierce teeth, and long, thin bodies. Yet most of these deep-sea horrors are very small-less than 1ft (30 cm) long.
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