Nor did the Antarctic represent to Shackleton merely the grubby means to a financial end. In a very real sense he needed it—something so enormous, so demanding, that it provided a touchstone for his monstrous ego and implacable drive. In ordinary situations, Shackleton’s tremendous capacity for boldness and daring found almost nothing worthy of its pulling power; he was a Percheron draft horse harnessed to a child’s wagon cart. But in the Antarctic—here was a burden which challenged every atom of his strength.

