Abyssal zone

From Freepedia

The abyssal zone contains the very deep benthic communities near the bottom of oceans. This zone remains in perpetual darkness, at depths varying from 2,000 to 6,000 meters (6,560 to 19,680 feet). Its permanent inhabitants – for example, the Swallower fish, Tripod fish, Deep-sea angler, and the Deep-sea squid – are able to withstand the immense pressures of the ocean depths, up to 775 kilograms per square centimeter (five tons per square inch). The deep trenches or fissures that plunge down thousands of feet below the ocean floor – for example, the midoceanic trenches such as the Marianas in the Pacific – are almost unexplored. Only the French bathyscaph Trieste has been able to descend to these depths. These regions are also characterized by continuous cold and lack of nutrients.