The abyssal realm is the largest environment in the Earth’s life, covering 300,000,000 square km (that is 115,000,000 square miles). This zone covers around 83% of the total area of the ocean and covers 6l0% of the Earth's surface. At depths of 3,000 to 6,000 meters (which is approximately 9,800 to 19,700 ft), this zone remains in acute darkness. “Abyss” is a term derived from a Greek word, which means bottomless. The abyssal zone which is also called the abyssopelagic zone is the layer of the pelagic zone of the ocean. The waters that are deeper than 6,000 m are being treated separately by ecologists. While this depth varies between 1,000 to 3,000 m. The upper boundary that lies between the abyssal zone and the overlying bathyal zone is the depth where the water temperature drops to 4° C (39° F).

The zone is defined mainly by the extremely uniform environmental conditions, which are being reflected as distinct life forms which belong to it. This zone is shallower than about 6,000 m (which is 20,000 feet). The abyssal zone is defined as the portion of the ocean which is deeper than about 2,000 m (that is 6,600 feet).

Hiw does life survive pressure abyss