Tonight we are hearing for the first time from a man who found himself in a situation so desperate he was convinced he was going to die. How he survived for six days out in the wild involved not only... See More
Tonight we are hearing for the first time from a man who found himself in a situation so desperate he was convinced he was going to die. How he survived for six days out in the wild involved not only astonishing grit but extraordinary ingenuity. Here's ABC's marzy -- Marci Gonzalez. Reporter: This is more than a badly broken leg. It's evidence of an amazing survival story. The situation turned into a life or death scenario. Reporter: Greg Hein was hiking alone, 13,000 feet up in an isolated area of the Sierra Nevada earlier this month when a Boulder slammed into his leg. He couldn't walk and knew it would be days before anyone started looking for him. Kind of incapacitates you. Reporter: So he wrapped his leg in an air mattress, made a splint out of hiking sticks and a belt, then slowly dragged himself down the mountain to an area where rescuers would be able to see him. I was going to crawl out or someone was going to rescue me. Reporter: For six days he survived by eating bugs and drinking melted snow until finally a search team spotted him. They were directly over me and didn't see me and then when they did I breathed a deep sigh of relief. Reporter: Now home from the hospital, the pain still intense, but the perspective he says he gained, priceless. Having those six days of just living with purpose is quite refreshing, really. To really be thankful for what you have in your life. Reporter: He's coming away from this with gratitude and some practical lessons for anyone planning to hike alone. The one thing he says he should have had, a satellite-linked device that could have shown search teams exactly where to find him. Brave guy, very tough, too. Absolutely. Thank you.
This transcript has been automatically generated and may not be 100% accurate.