Underwater pressure is equal to more than 17,000 containers of water sitting on your head. Its sufficient to reduce a normal Styrofoam cup into a two-inch-tall miniature. To operate in the deep sea, the animals that live in the deep sea also have to settle in their parts to carry on the dark, cold surroundings. Most are made almost exclusively of solid and liquid matter, with no air pockets anywhere. That's because water force only affects the empty places in the body, places where there is air. For example, when you're underwater at the bottom of a pool, your ears spoil from the water pressure, but not your arms or legs.

Instead of the air bags that fish use to control their resilience, some deep-sea creatures use chemical changes in their blood. Many creatures have inflated eyes to help them see in the dark. Some produce their own light, called bioluminescence, to help attract prey or find a mate. The cruel deep-sea surroundings also forces deep-sea creatures to be inventive when it comes to ruling their next meal. Some hunt other deep-sea animals, while others live on "marine snow," organic dissipate from above that's been used over and over again and drift down into the all-time low.

Unlike approximately any other place on Earth, some parts of the deep sea don't depend on the sun as the liveliness source for the food cycle. In these areas, the life cycle begins with chemosynthesis—chemicals mortal eaten by bacteria, then sea creatures eating the bacteria. The chemicals come from "cold oozes," or ocean floor vent.