To tap the precious oil reserves in the North Sea, workers must travel hundreds of kilometres by helicopter over treacherous waters to reach their remote drilling platforms. The region is notorious for its turbulent weather, so the pilots of Super Puma helicopter are not surprised when a storm develops during a routine worker transport on January 19, 1995. Already pelted with icy rain, the pilots are struggling to navigate their way through the blinding storm when the unthinkable happens: their helicopter is struck by lightning. The controls shudder and fail, and the pilots are finally forced to ditch into the icy water . They hit the stormy sea and are forced to ditch the helicopter, squeezing 18 people onto an evacuation raft . But when the raft is punctured by a jagged piece of the destroyed chopper, it becomes a life-or-death race between the rising frigid water and the rescue ships desperately searching for the overloaded raft.