Prince William Sound, AK (Mar. 28)--Coast Guardsman checks oil recovery mesh as others steam blast rocks and shorelines soak by with crude oil from the spilled tanker Exxon Valdez. The Exxon Valdez ran aground on Bligh Reef in Prince William Sound, Alaska, March 23, 1989 spilling 11 million gallons of crude oil, which resulted in the largest oil spill in U.S. history. U.S. COAST GUARD PHOTO