Aron Ralston is a classic example of someone who did the unthinkable. After slipping into a canyon slit, he amputated his arm from the elbow down in order to escape an 800-pound boulder. He was then rescued after making his way out of the canyon which he called home for nearly a week.

In 2013, another astonishing story took place involving Marco Lavoie. A 44-year-old outdoorsman of Canada facing likely death under the most extreme of conditions. Sometimes nature’s most terrifying moments can only be faced head-on with the fiercest determination and will to survive.

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