It's
one of America's biggest environmental disasters and the largest oil
slick in the Gulf of Mexico since 1979. As experts scramble to stop the
leak, find out what happened to the oil rig Deepwater Horizon as a
blowout tore it apart, killing 11 of 126 men on board and sending oil
toward Louisiana, Mississippi, Alabama and Florida coastlines. The
special contains never-before-seen footage obtained from the U.S. Coast
Guard, NGC's production crew and emergency response crews of the
aftermath