FILE - In this April 17, 1989, file photo, a worker makes his way across the polluted shore of Block Island, Alaska, as efforts are underway to test techniques to clean up the oil spill of the tanker Exxon Valdez in 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/John Gaps III, File)