This is the account of five British men in an open, rigid inflatable boat fighting for their lives in perhaps the most dangerous and unpredictable seas in the world. It started out as a carefully calculated attempt to complete the first unassisted crossing of the frozen north Atlantic in a rigid inflatable boat, but it became a terrifying battle against storm-force winds, crashing waves and icebergs as large as cathedrals. Starting from the remote north Canadian coastline, Grylls and his crew crossed the infamous Labrador Sea, pushed on through ice-strewn waters to Greenland and then found themselves isolated in a perfect storm 400 miles from Iceland.