"Bound for Antarctica, where polar explorer Ernest Shackleton planned to cross on foot the last uncharted continent, the Endurance set sail from England in August 1914. In January 1915, after battling its way for six weeks through a thousand miles of pack ice and now only a day's sail short of its destination, the Endurance became locked in an island of ice. For ten months the ice-moored Endurance drifted northwest before it was finally crushed. But...