they were tired now to the point of exhaustion. They found a little sheltered spot behind a rock and sat down, huddled together with their arms around one another for warmth. Almost at once Worsley and Crean fell asleep, and Shackleton, too, caught himself nodding. Suddenly he jerked his head upright. All the years of Antarctic experience told him that this was the danger sign—the fatal sleep that trails off into freezing death. He fought to stay awake for five long minutes, then he woke the others, telling them that they had slept for half an hour. Even after so brief a rest, their legs had
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