Dang!
There are a lot of things down there in the water we haven't found, and certainly haven't studied yet. I saw a video some years ago, shot in the 1980s, from a camera submerged a thousand feet or more along the footings of an oil rig platform in the Gulf of Mexico. Purely industrial application, they were checking the integrity of the platform base. As they recorded, a number of fish swam by, then, from right to left, came this corkscrew creature, several feet in length, coiling past, slowly and peacefully. As far as I know, nobody to this day has identified the thing.
caw