[Pastiche]

http://www.nytimes.com/2010/05/04/us/04spill.html

At least one worker who was on the oil rig at the time of the explosion on April 20, and who handled company records for BP, said the rig had been drilling deeper than 22,000 feet, even though the company’s federal permit allowed it to go only 18,000 to 20,000 feet deep, the lawyers said.

Divest BP.

Another worker familiar with the rig told the lawyers that the company had chosen not to install a deep-water valve that would have been placed about 200 feet under the sea floor. Much like blowout preventers, devices that are meant to seal leaks, this valve could have served as a cutoff of last resort in explosions, the lawyers said.

I reiterate.