One of the biggest offshore disasters in history. In July 1988, a fire breaks out on the Piper Alpha - a vast oil rig in the North Sea. Those stationed on board are thrust into a hell on earth.

Documentary filmmaker Marc Wolfensberger visited the rig in the late 1990s, before making his acclaimed film "Oil Rocks: City Above the Sea" in 2009. "It was beyond anything I had seen before," he ...