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
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
Bigfin squid
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Bigfin squids are a group of rarely seen cephalopods found in deep-sea zones with a distinctive morphology. They are placed in the genus Magnapinna and family Magnapinnidae. Although the family was de
Hadal zone
…assuming trimethylamine N-oxide requirements follow the observed approximate linear relationship with depth. Some invertebrates do occur deeper, such as bigfin squid, certain polynoid worms, myriotrochid sea cucumbers, turrid snails and pardaliscid amphipods in excess of 10,000 m (33,000 ft). In addition, giant…
Long Arm Squid
A juvenile Magnapinna talismani, the first known species from the family, with damaged arms
A bigfin squid filmed by Okeanos Explorer in 2012