BP spill left big oily 'bathtub ring' on seafloor
New research shows that the BP oil spill left an oily "bathub ring" on the sea floor that's about the size of Rhode Island.
The study by David Valentine, the chief scientist on the federal damage assessment research ships, estimates that about 10 million gallons of oil coagulated on the floor of the Gulf of Mexico around the damaged Deepwater Horizons oil rig. Valentine said the spill left other splotches containing even more oil.