Among the fascinating and peculiar animals residing in the deep sea, perhaps the most captivating are those elusive creatures that occasionally grace deep-water cameras, only to vanish into the abyss before scientists can investigate further.

Many of these enigmatic animals have yet to be classified by researchers, including a peculiar squid that features elbows, large undulating fins, and long, spaghetti-like tentacles.

Squid specialists have analyzed available footage and largely theorize that these specimens belong to the bluefin squid family, specifically the Magnapinidae. This family was initially identified in 1998 from a handful of rare squid larvae.

No adult bluefin squid have ever been captured with a net; they have only been documented through photography.

While adult squid resemble their larvae counterpart, definitive relationships remain uncertain until a specimen is brought to the surface.

Nevertheless, deep-sea scientists continue to speculate about the lives of these mysterious squids. The characteristic “elbow stance” (illustrated below) is commonly employed by bluefin squid to capture prey.

When hunting, they extend their arms and tentacles away from their bodies, spreading them out like spider legs and bending them at 90 degrees. Meanwhile, the remaining tentacles trail through the water, likely creating a wide net to passively ensnare prey.

In 2024, a bluefin squid was observed traversing the ocean floor on its tentacles in the southwestern Pacific Ocean, possibly in search of food. At one point, the squid’s sticky tentacles seemed to get caught on something out of the camera’s frame. It amusingly tugged at the obstruction for several seconds until it freed itself and swam off.

This squid was documented at approximately 3,300 meters (10,830 feet) deep. Another specimen was recorded nearly double that depth, at 6,212 meters (20,380 feet) in the Philippine Trench, marking it as the deepest squid ever noted.

Its relative, the dumbo octopus, which swims using fins resembling giant elephant ears, dives even deeper, having been spotted near 7,000 meters (23,000 feet).

Bluefin squid have been photographed in various locations worldwide, including Brazil, West Africa, the Gulf of Mexico, and the Indian Ocean. This wide distribution suggests that this family may consist of multiple species.

In 2015 and 2017, research in the Great Australian Bight involved towing a camera through deep waters ranging from 900 to 3,000 meters (approximately 2,950 to 9,840 feet). During this study, the bluefin squid was captured on camera five times, marking the first sighting in Australian waters.

These squids exhibit impressive features when they showcase their tentacles, often much longer than their bodies; however, they are relatively small. The squid photographed in Australia measured between 6 to 15 centimeters (about 2 to 6 inches) long, with tentacles extending up to 1.5 meters (almost 5 feet).

Yet, the possibility remains that larger bluefin squids are still lurking, hidden in the vast ocean depths just out of view.

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