FILE - In this April 4, 1989, file photo, the grounded tanker Exxon Valdez, left, unloads oil onto a smaller tanker, San Francisco, as efforts to refloat the ship continue on Prince William Sound. The Exxon Valdez tanker struck Alaska‚Äôs Bligh Reef on March 24, 1989, while bound for California. It spilled about 11 million gallons of crude oil, which storms and currents smeared across about 1,300 miles of shoreline. (AP Photo/Rob Stapleton, File)