Abyssal plain
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An abyssal plain is an underwater plain on the deep ocean floor, usually found at depths between 3,000 and 6,000 metres. Lying generally between the foot of a continental rise and a mid-ocean ridge, a
Tubeworms and soft corals at a cold seep 3000 meters deep on the Florida Escarpment. Eelpouts, a galatheid crab, and an alvinocarid shrimp are feeding on chemosynthetic mytilid mussels.
Hadal zone
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The hadal zone, also known as the hadopelagic zone or hadalpelagic zone, is the deepest region of the ocean, lying within oceanic trenches. The hadal zone ranges from around 6 to 11 km below sea level
Abyssal plain
…that would flourish in the oxygen-enriched waters above. Deep sea coral reefs are mainly found in depths of 3,000 meters and deeper in the abyssal and hadal zones. Abyssal plains were not recognized as distinct physiographic features of the sea floor until the late 1940s and, until recently, none had been studied…
Schematic representation of the zones in the ocean
The supergiant amphipod (Alicella gigantea) is found in the Hadal zone (collected from Japan Trench, 2022)
Bathyscaphe Trieste in 1958, used by Piccard and Walsh to reach Challenger Deep