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About 39 minutes before the explosion, pressure was building in the well.
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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.
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The highest number was 679 millisieverts, for a worker who helped to prepare venting as rising pressure threatened an explosion.
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The explosion of federal debt has increased pressure on politicians to decide which functions of government are indispensable and which should be dialed back.
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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.
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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.
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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".
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"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.
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