METAIRIE, La. - Ralph Linenberger, forensics of the Deepwater Horizon blowout preventer stack for BP, testifies at the joint investigation hearing, April 8, 2011. The Coast Guard and the Bureau of Ocean Energy Management, Regulation and Enforcement are co-chairing the fact-finding investigation launched to determine the cause of the initial incident and fire aboard the mobile offshore drilling unit Deepwater Horizon. U.S. Coast Guard photo by Petty Officer 3rd Class Casey J. Ranel.
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