Perhaps it's "The Thing"

[PaulVS]

I wonder why at <300 feet this is such a "mystery"....

Mysterious UFO-like object spotted on sea floor | Crave - CNET

(Sorry if it's a repost, I couldn't find anything on it with a search)

 

[fjpatrum]

Looks like the Millennium Falcon, to me.
http://3.bp.blogspot.com/_IYihBiTh-...5AE8CE68890E38080E5898DE3818BE38289-4d64d.jpg

 

[AeroMike]

Yeah, I wondered too why he hasn't sent done a ROV and checked it out. Maybe it is weather, or maybe he already did and does not want it known what he found.