1914. Following the shattering news of Scott's death on his return journey from the South Pole, Shackleton formulates a new challenge on Antarctica. Sailing south in 'Endurance', his expedition will cross the vast continent.

December 1916. After the loss of 'Endurance', Shackleton and his 27 men endeavour to cross the frozen Weddell Sea. Land lies 350 miles away, and as they drift helplessly northwards they know that soon the ice will break beneath them.