The highest number was 679 millisieverts, for a worker who helped to prepare venting as rising pressure threatened an explosion.

WSJ: In Japan, Relief at Radiation's Low Toll

About 39 minutes before the explosion, pressure was building in the well.

WSJ: BP Tries to Shift Blame for Spill to Transocean

At 8:20 p.m. on the day of the explosion the pressure data suggest there was a constant flow of sea water being pumped into the drill pipe that was displacing the heavier mud system which was the primary pressure control for the well.

WSJ: The Oil Disaster Is About Human, Not System, Failure

The explosion of federal debt has increased pressure on politicians to decide which functions of government are indispensable and which should be dialed back.

WSJ: Ryan Selection Sets Off Debate on Government

Officials said a circuit board and battery pack - parts of a triggering mechanism - had been recovered and the lid of a pressure cooker, apparently blown off during the explosion, was found on the roof of a nearby building.

BBC: Boston Marathon 'bombing suspect' seen on video

He added that "at a gas governor site in Wales which regulates gas pressure, a theft of a few pounds of copper could have led to an explosion".

BBC: Police target ?770m worth of metal cable thefts

Sources close to the investigation tell Forbes that Transocean engineers had last checked the blowout preventer 10 days before the rig explosion, and that BP believes the device suffered a leak of hydraulic pressure, preventing it from being able to shut the well.

FORBES: Fingers Crossed: Will BP's Box Stop Oil Spill?

"We find the pressure cooker embedded in the car down the street, so there's a major explosion during this gunfight (with) my officers -- six of my officers that I'm extremely proud of, " Deveau said.

CNN: SHARE THIS

Instead, he found it had failed to operate at maximum allowable operating pressure--odd, given that this pressure is usually the upper limit for safety and El Paso was under federal restrictions after an August 2000 pipeline explosion killed 12 campers in New Mexico.

FORBES: Hot Seat