The Transocean Discoverer Enterprise drill ship collects oil from the site of the Deepwater Horizon oil well as workers try to stem the flow of the spill in the Gulf of Mexico, June 12, 2010. Saul Loeb/AFP/Getty Images hide caption

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July 2010: Two pelicans sit on booms protecting Queen Bess Island, La., from oil that spilled after the Deepwater Horizon rig exploded in April. Chris Graythen/Getty Images hide caption

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Men fish off a pier at a jetty in Dauphin Island, Ala., with oil rigs in the background. The U.S. government is changing how it regulates drilling platforms.

Mario Tama/Getty Images hide caption

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April 21, 2010: Fire boats battle the blaze on the Deepwater Horizon rig. U.S. Coast Guard/Getty Images hide caption

itoggle caption U.S. Coast Guard/Getty Images