You probably can’t even begin to imagine making the decision to amputate your own arm with a dull knife. But on January 22 2015, Kai Micholsten was left with no other choice. An 800-pound boulder fell on his arm and trapped him in a Utah canyon wall.
After lying pinned to the canyon for five days, Kai, running out of food and water, thought chances of being found were slim. He leveraged the boulder to make his bones snap, and he then used his pocket knife to cut away his muscles and tendon. Amazingly, he abseiled down a 65 foot wall and walked until hikers found him.