During the 1912 Thule Expedition, Arctic explorer Peter Freuchen got buried deep under snow after a snowstorm. Lacking any spears or daggers, he used his own feces to fashion a dagger with which he freed himself. During another expedition in 1926, gangrene got his toes because of frostbite and before it got worse, he amputated his own toes with a hammer without anesthesia and replaced his leg with a peg.
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