Deep Sea Creature

These creatures live in very harsh environments such as the abyssal or hadal zones, which, being thousands of meters below the surface, are almost completely devoid of 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 of feet deep in the ocean have adapted to the high pressure, lack of light, and other factors.
Barometric pressure
These animals have evolved to survive the extreme pressure of the sub-photic zones. The pressure increases by about one atmosphere every ten meters. To cope with the pressure, many fish are rather small, usually not exceeding 25 cm in length. Also, scientists have discovered that the deeper these creatures live, the more gelatinous their flesh and more minimal their skeletal structure. These creatures have also eliminated all excess cavities that would collapse under the pressure, such as swim bladders.