Deep sea creatures are fish and other creatures that live down in the deepest part of the ocean. It is very cold down at the bottom and there is no sunlight only the light produced by the some of the creatures. Almost every deep sea creature has a cell in their body that makes a light.
If a deep-sea fish or creature from the bottom of the ocean to the twilight zone is brought up to the surface, their organs and eyes will explode and they will die. Fish of the deep-sea have a light that they produce from a cell in there body. The light that they produce is a greenish-yellow color.
Some of the deep sea cretures are shown below.
The Glass Squid