Relating to the deepest parts of the ocean, deeper than 6,000 meters, found in oceanic trenches. This zone represents the most extreme deep-sea environment on Earth, with crushing pressure and unique geological features.
Named after Hades, the Greek underworld, reflecting the extreme depths and harsh conditions of these oceanic trenches. The term was coined by Danish oceanographer Anton Bruun in 1956 to describe this deepest zone of marine environments.
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