FILE - In this May 6, 2010 file photo, the containment vessel is lowered into the Gulf of Mexico at the site of the Deepwater Horizon rig collapse. Retired Coast Guard Adm. Thad Allen, the federal ... more 
FILE - In this May 6, 2010 file photo, the containment vessel is lowered into the Gulf of Mexico at the site of the Deepwater Horizon rig collapse. Retired Coast Guard Adm. Thad Allen, the federal government's point man on the disaster, said Sunday, Sept. 19, 2010, BP's well "is effectively dead." A permanent cement plug sealed BP's well nearly 2.5 miles below the sea floor in the Gulf of Mexico, five agonizing months after an explosion sank a drilling rig and led to the worst offshore oil spill in U.S. history. less 
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Associated Press | Photo By Gerald Herbert, File
Tue, Sep 21, 2010 10:15 AM EDT