An expert testified that when something goes wrong with a well, the fail-safe device's shears are supposed to clamp down, cut and seal the drill pipe, preventing the oil from escaping. But in the case of the Deepwater Horizon rig in the Gulf of Mexico, it didn't work quite right.
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Full story at http://www.npr.org/2011/04/05/135129282/blowout-preventer-theory-debated-in-oil-spill-inquiry?ft=1&f=1006
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