It was the last line of defense, the final barrier between the rushing volcanic fury of oil and gas and one of the worst environmental disasters in United States history.

Its very name -- the blind shear ram -- suggested its blunt purpose. When all else failed, if the crew of the Deepwater Horizon oil rig lost control of a well, if a dreaded blowout came, the blind shear ram's two tough blades were poised to slice through the drill pipe, seal the well and save the day. Everything else could go wrong, just so long as "the pinchers" went right. All it took was one mighty stroke.

Read the entire New York Times article here.