Ernest Shackleton and the 27 men who joined his expedition found that he was true to his word. They had drifted with the pack ice of the Weddell Sea for ten months, their ship had sunk, and they were castaways in one of the most hostile environments on earth, hundreds of miles from land. And so, with his dream of becoming the first man to cross Antarctica long abandoned, Shackleton set his mind to a far greater challenge: bringing his crew safely home.