In this Sept. 4, 2010 file photo, the Deepwater Horizon blowout preventer is lifted out of the Gulf of Mexico by the Helix Q4000 near the coast of Louisiana. Before the key piece of evidence has even been analyzed, oil giant BP PLC on Wednesday, Sept. 8, 2010, planned to release the conclusions of its internal investigation into the rig explosion that killed 11 workers and led to the massive Gulf of Mexico spill. (AP Photo/Patrick Semansky, File)
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