Deepwater Horizon Guide
The disaster began not with a slow leak, but with an apocalyptic explosion. On the evening of April 20, 2010, the rig crew was finishing the cementing of the well. A critical job, the cement plug is the primary barrier that prevents highly pressurized oil and gas from escaping the reservoir and shooting up the drill pipe.
Deepwater Horizon Accident Investigation Report Executive Summary Deepwater Horizon
