May 12, 2010 8:21 PM

Oil spill: BP had wrong diagram to close blowout preventer

In the days after an oil well spun out of control in the Gulf of Mexico, BP engineers tried to activate a huge piece of underwater safety equipment but failed because the device had been so altered that diagrams BP got from the equipment's owner didn't match the supposedly failsafe device's configuration. That meant that when engineers thought they were activating the blowout preventer to crimp the well's pipe, they were actually activating a piece of test equipment.

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