Alan J. Jamieson , a scientist at the University of Newcastle, has published in Marine Biology that he has managed to exceed 1,800 meters of depth the identification of an octopus.
Specifically, two direct observations of the cirrad octopod Grimpoteuthis sp. , commonly known as Dumbo octopus, at 5760 and 6957 meters in the Java Trench (Indian Ocean).
Dumbo Octopus
In April 2019, three identical autonomous bait chambers and traps with conductivity, temperature and depth sensors were deployed during the Indian Ocean leg of the Five Deeps Expedition (2018-2019) .
Cephalopods are generally not considered characteristic of benthic fauna at hadal depths (depths greater than 6,000 meters). In this study, unequivocal sightings are reported, thus, increasing the potential benthic habitat available to cephalopods from 75 to 99% of the global seafloor.
Sometimes called "Dumbo octopuses" for their ear-like fins, which are projected onto their "heads" (bodies), resembling the flying ears of the Walt Disney elephant. The largest specimens reach 20 cm, but little is known about their habits . The "Dumbo octopus" has 8 tentacles with 60 to 70 suckers on each one. Their distribution pattern distinguishes whether they are male or female. There are 13 species discovered so far. Each of these is of various colors (red, white, brown, pink), sizes and shapes.