HOUSTON - Joseph Keith, a senior mud logger for Sperry Sun, swears in before the joint investigation board at the sixth session of hearings for the Deepwater Horizon explosion here, Dec. 7, 2010. The Coast Guard and the Bureau of Ocean Energy Management, Regulation and Enforcement (BOEM) are co-chairing the fact-finding investigation launched to determine the cause of the initial incident and fire aboard the mobile offshore drilling unit (MODU) Deepwater Horizon. U.S. Coast Guard photo by Petty Officer 3rd Class Elizabeth H. Bordelon.
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