On March 24, 1989, the supertanker Exxon Valdez ran aground in the pristine waters of Alaska's Prince William Sound, spilling 11 million gallons of crude oil. Jean-Michel Cousteau, son of Jacques Cousteau, takes us on a voyage to investigate first-hand the devastating impact of the U.S.'s largest oil spill. Amid the majestic mountains and ice floes of this serene setting, the leaking oil spreads like a virus staining and often killing everything it encounters. Harbor seals, sea otters, and bald eagles fall victim to the tragic accident.