KENNER, La. - Christopher Pleasant, a subsea supervisor with Transocean, swears in before testifying at the Deepwater Horizon joint investigation hearing into the incident, May 28, 2010. The Coast Guard and Minerals Management Service are co-chairing the joint 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 Senior Chief Petty Officer Mike O'Berry.