Underwater Creature

The term 'Deep Sea refers to organisms that live below the photic zone the ocean. These creatures must survive in extremely harsh conditions; such as hundreds atmospheres pressure, small amounts oxygen, very little food, no sunlight, and constant, extreme cold. Most creatures have to depend on food floating down from above.
These creatures live in very harsh environments such as the abyssal or hadal zones, which, being thousands meters below the surface, are almost completely devoid light. The water is very cold (between 3 and 10 degrees Celsius, or 37 and 50 degrees Fahrenheit), and has low oxygen levels. Due to the depth, the pressure is between 20 and 1,000 atmospheres. Creatures that live thousands feet deep in the ocean have adapted to the high pressure, lack light, and other factors.