The grounded tanker Exxon Valdez, left, unloads oil onto a smaller tanker, San Francisco, in April 1989 at Prince William Sound, after the Exxon Valdez ran aground on Bligh Reef and caused the largest oil spill in U.S. history. Six oceanographic, underwater buoys will be anchored to the ocean floor in Prince William Sound this spring for use by emergency responders if there is another big oil spill.
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