First charges brought in Deepwater Horizon aftermath

Deepwater Horizon on fire in 2010 Credit: Reuters

Investigators have been looking into the causes of the blowout and the actions of managers, engineers and rig workers at BP and its sub-contractors Halliburton and Transocean in the days and hours before the April 20 2010 explosion.

The case against the former BO engineer Kurt Mix - who now faces charges - focuses only on the aftermath of the blast, when BP scrambled for weeks to plug the leak.

Even then, the charges are not really about the disaster itself, but about an alleged attempt to thwart the investigation into it.