Disasters are deeply revealing. The 2010 blowout of the Deepwater Horizon oil rig in the Gulf of Mexico occurred because government and industry safety measures were overmatched by the operation’s regulatory and technical complexity. Personnel were improperly trained and supervised, corners were cut on safety, the installed technology failed in dozens of ways, and response efforts were inadequate to address the scope and scale of the catastrophe. As a result, 11 people died and 210 million gallons of oil spilled into the Gulf. It is by far the worst oil industry disaster in history.