The 2010 BP oil spill that spewed 172 million gallons of oil into the Gulf of Mexico over the summer before finally being capped left what researchers describe as a "bathtub ring" on the Gulf's sea floor that's about the size of Rhode Island.

David Valentine, the chief scientist on the federal damage assessment research ships, estimates in his study that some 10 million gallons of oil coagulated on the sea floor around the oil rig where the well blew. Oil levels inside the 1,200-square-mile ring were as much as 10,000 times higher than outside it, according to Valentine.

BP is questioning the study's conclusions.

[Metro Networks]

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