CNN Wire Staff
(CNN) - Faulty cementing, a misread pressure test and an improperly maintained blowout preventer all contributed to the April 20 explosion that uncorked the worst oil spill in U.S. history, BP's investigation of the disaster concluded Wednesday.
BP said its team aboard the doomed oil rig Deepwater Horizon "incorrectly accepted" results of a negative pressure test aboard the rig before the blast, but the company's internal report assigns much of the blame to rig owner Transocean and cementing contractor Halliburton. The three companies have repeatedly pointed fingers at each other since the explosion, which killed 11 workers and resulted in an estimated 4.9 million barrels (205 million gallons) of oil spilling into the Gulf.
Anderson Cooper goes beyond the headlines to tell stories from many points of view, so you can make up your own mind about the news. Tune in weeknights at 8 and 10 ET on CNN.
Questions or comments? Send an email
Want to know more? Go behind the scenes with