The hadal zone, also known as the hadopelagic 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, and exists in long,
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