That firm suffered a loss after a 2008 spill caused by Sinopec, one of the three large state oil companies.

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That incident led to the largest-ever oil spill in U.S. waters and the loss of 11 lives.

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The Deepwater Horizon rig - operated by Transocean on behalf of BP and its partners - exploded on 20 April and later sank with the loss of 11 lives, leading to the worst oil spill in US history.

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