Inadequate staff training, poorly built safety systems and improper equipment maintenance may have played roles in last year's Deepwater Horizon rig blast that killed 11 workers and caused a massive oil spill in the Gulf of Mexico, a U.S. Coast Guard probe said. According to the report, Transocean "had serious safety management system failures and a poor safety culture." "We strongly disagree with -- and documentary evidence in the Coast Guard's possession refutes -- key findings in this report," Transocean said.

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