Bathynomus giganteus is actually a deep-sea scavenger that feeds on dead whales, fish and squid. Known as an isopod, the creature can grow to be about 3 feet long. Its ample growth is speculated to be in relation to the cold water in which it dwells.
Seeing the pictures, it seems that the crablike creature is a giant Bathynomus Giganteus. The Bathynomus Giganteus is a large isopod which lives in the deep waters of Atlantic and Pacific Sea. The Bathynomus Giganteus, shown in the pictures shared by the technician, measures about two-and-a-half from head to tail.
They're not a major fishing target, although they do have a foodie fan base in some coastal parts of East Asia.
Many people, like myself, are fairly disgusted when they look at bathynomus giganteus photos. I think it's because they look like giant underwater bugs. This one actually is related to the pill bug which it resembles.
I love all sea creatures, and support efforts to protect them. Having said that, I would panic, and drown, if I saw this Bathynomus Giganteus giant isopod underwater.
Pictures of the Giant Isopod Bathynomus Giganteus,