posted on Mar, 11 2016 @ 07:22 AM
Bacterial gases are responsible for bloating and possible floating they usually have some odor related to decay...
It looks as if digested, perhaps a reason for non decay odors?
Maybe lab test can confirm its genetic relation and detect potential digestive enzymes if found to be digested carcass of some kind or just carcass
and not some petroleum - plastic like material. Keeping in mind Fukushima still and potentials forgotten undersea drifting...