This looks very similar to a solengastre I photographed in the waters off Grand Cayman, BWI initially 5 years ago. It created a stir among experts at the time, as Know one had seen the likes of this particular one before. Photographed at nearly the same depth, I photographed another, or the same, in the same area last year. The difference between the two appears to be that some of the white areas on mine are raised into tiny ping pong ball extensions.
I understand that experts are eager to have a specimen collected. Unfortunately, in order for me to do so, a special permit would be required, and there is no telling if I'd ever find one again.