The Deep, Dark Sea Life isn't easy in the deep, dark sea. Water pressure can exceed 2 tons per square inch, the temperature of the sea water is near fresh water's freezing point, and it is completely dark.
Scientists think that only one per cent of all ocean species live here.
Only animals live here, and most must scavenge the remains of dead plants and animals which drift down from the ocean's upper layers. These animals have unique organs and appendages which allow them to function in the near-total darkness. These creatures use their luminoscity in different ways. Some flash their lights on and off to attract a mate. Others lure their prey within striking distance with special glowing appendages that look like worms or other food.