I’d vote for it being a whale’s placenta, with the ‘‘organs’’ in question being remnants of it’s umbilical cord. I’m no expert, but I think that the pattern on it’s surface could’ve been remnants of it’s blood vessels. Most of it’s movements looked like something that could come about if a light, lifeless item was subjected to some unexpected underwater currents, perhaps caused by the cameras own movements.
It’s hard to even put a comparable size scale on that thing. It’s like that video with the worms in a tunnel all over again - the subject could be a meter in length and it could also be the size of a man’s palm. I’m no diving expert, I don’t even know what that white rocket-like thing near the camera is. I thought at first that the footage was taken by a deep-sea diver, but by now I’m leaning more towards a remote-controlled camera due to the apparent depth and the mechanical feel of the movements as the camera focuses on the object in question. I guess that whoever took it will step forth soon enough. They must’ve had equipment down there for a reason, after all, and finding something strange like that would do well to any man’s research.
EDIT: The smallish logo on the lower left corner seems to indicate that the equipment belongs to Petrobras, a brazilian oil company. And here I was, thinking they were researchers.