The Super Puma helicopter is the workhorse of the North Sea oil industry, able to ferry workers to and from offshore drilling platforms in the harshest of conditions. However, a January 1995 storm proves too much for one chopper, sending it spiraling into the frigid sea, and putting the lives of 18 in peril. Follow the passengers' and crew's hair-raising struggle to stay alive on a tiny raft in a vast, turbulent sea, the race for rescuers to find them, and the follow-up investigation that revealed a shocking, hidden danger.