Aaron Ralston, a 27-year-old mountain sports fanatic from Colorado in the United States, found himself in dire straits alone in a canyon in the desert when a 500kg rock came crashing down the canyon to smash his right hand and trap it against the canyon wall. A terrible accident, but the situation was made all the more serious because on this occasion Aaron had failed to tell anyone where he was going. At the last minute the plans for a trip with his climbing partners had fallen through, and on the spur of the moment he decided to head out on his own to cycle up a long mountain trail, leave his bike and then walk down the Blue John canyon. No one had the slightest idea where he was.