Resembles eerie black balloons released from the sea floor
Live feeds from Boa Deep C ROV, July 31, 2010 at 1:02 a.m. EDT:
'Sonar Scan NW' of BP Oil Spill Disaster
Clear shot at 0:18 seconds in.
Feed freezes ending video capture.
Black blobs can also be seen here:
Still photo from first video above:
*Update: Compare to this underwater shot of the Kalamazoo River oil spill in Michigan, from Headline News on July 31, 2010: