When we read accounts of polar exploration today, we are impressed. When we read of the exploits of men such as Ernest Shackleton we are astounded. To survive under the conditions that he and his men experienced, with equipment deemed primitive by today's standards, is almost beyond our ken. Shackleton tells the story of his last expedition (1914-1917) when his ship, the Endurance, was crushed by pack ice. He went on to complete an 800-mile open boat journey and then a twenty-mile hike through the mountains in order to save his men. And he did.
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