oil plumes

Three groups of researchers are now reporting evidence of large plumes of oil far below the surface of the Gulf of Mexico. This growing proof that an unknown quantity of oil from the ruptured Deepwater Horizon rig is now accumulating in deeper waters of the gulf comes after BP chief executive Tony Hayward said his company found “no evidence” of such plumes. Hayward also maintained that oil is lighter than water and thus will float to the top of the gulf.