Comments on: The single-hull tanker Exxon Valdez ran aground on Bligh Reef in Prince William Sound, Alaska, March 24, 1989, spilling 11 million gallons of crude oil. This spill inspired the Oil Pollution Act of 1990, which required the phase out of single-hull tankers and tank-barges by January 1, 2015. (U.S. Coast Guard)

An inside look at the science of cleaning up and fixing the mess of marine pollution