http://d.yimg.com/a/p/ap/20100507/ca...Ly6p9ABC6e5A--AP - The deadly blowout of an oil rig in the Gulf of Mexico was triggered by a bubble of methane gas that escaped from the well and s*** up the drill column, expanding quickly as it burst through several seals and barriers before exploding, according to interviews with rig workers conducted during BP's internal investigation.
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