Relating to the deep layer of the open ocean, extending from about 1000 to 4000 meters depth. This zone is completely dark, cold, and under immense pressure.
From Greek 'bathys' meaning 'deep' and 'pelagic' meaning 'of the sea.' The term was established in oceanographic literature in the mid-20th century as deep-sea exploration revealed distinct biological and physical characteristics at different depths.
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