June 8, 2010 1:39 PM

Oil layers below Gulf's surface may be cleanup challenge

Researchers have confirmed that oil is floating as deep as 3,300 feet below the surface of the Gulf of Mexico, a finding that Coast Guard Adm. Thad Allen suggested Tuesday will pose a cleanup challenge. "We have not generally done subsurface response," Allen said. "In my personal experience, I have not dealt with it."

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