Mysterious blob filmed in the deep

A mysterious ocean 'blob' has been recorded by a deep-sea remote-controlled underwater camera.
The creature looks like nothing seen before, with speculators suggesting it is everything from a jellyfish to the remains of a whale placenta.
While, at a quick glance, the description of a jellyfish makes sense, the creature has organs and appendages never spotted on a jellyfish before.
Meanwhile it could be a whale placenta, but if that is the case then the hexagonal shapes on the skin are a mystery.