New Orleans — A Coast Guard probe of the Deepwater Horizon explosion has concluded that rig owner Transocean had serious flaws in its safety management system and a poor safety culture that contributed to the disaster.
Friday's report also found that lax oversight by the rig's flag state, the Republic of the Marshall Islands, was ineffective in preventing the disaster.
A panel of officials from the Coast Guard and Bureau of Ocean Energy Management Regulation and Enforcement held a series of seven hearings for its probe of the Deepwater Horizon disaster.
The bureau is expected to release its own preliminary report on the explosion before the two agencies issue a joint final report later this year.
The April 20, 2010, rig blast killed 11 workers and triggered the nation's worst offshore oil spill.