The Macondo incident failed due to the failure of the BOP atop the Macondo well. The BOP was designed to activate and seal the well if control was lost, even in a “low probability, high impact event”, such as the blowout that occurred the evening of April 20, 2010. The report released from NAE/NRC, entitled “Macondo Well-Deepwater Horizon Blowout, lessons for improving offshore Drilling Safety”, summarized the known and suspected reasons for why the BOP failed:
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