Oceans have abyssal depths, defined as regions where life exists in the total absence of light. Until the 20th century, it was widely accepted that no life could survive in low temperatures and complete darkness. We now know that life not only survives below 400 metres (1,312 feet) but exists even at nearly 11,000 metres (36,089 feet) in the deepest oceanic depressions known to man. Having developed features such as bio-luminescence, these animals thrive in astounding variety.
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