It’s fifteen years since Aron Ralston set off for a few days of fun and relaxation in Utah’s Bluejohn Canyon. He became trapped by a boulder and the resulting ordeal lasted 127 hours. Aron’s remarkable survival story was turned into a film by Danny Boyle. He told Anna Foster how it happened, how he managed to survive, and how he has a 'new boulder in his life' he's trying to overcome.