Several operating deficiencies on Transocean's Deepwater Horizon rig may have worsened the Macondo well blowout in the Gulf of Mexico, said Vice Adm. Brian M. Salerno, deputy commandant for operations at the U.S. Coast Guard. The deficiencies "included poor maintenance of electrical equipment that may have ignited the explosion, bypassed hydrocarbon gas alarms and automatic shutdown systems, and training shortfalls in critical areas such as engine-shutdown and emergency well-disconnect procedures," Salerno said during a House committee hearing.

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