Despite these changes, with which he was initially uncomfortable, Ralston says the rest of the film is 'so factually accurate it is as close to a documentary as you can get and still be a drama.' The scenes early in the film of Ralston's encounter with the two hikers were altered to portray Ralston showing them a hidden pool, when in reality he just showed them some basic climbing moves. Ralston himself, his wife and son make cameo appearances at the end of the film. Treat Williams as Larry Ralston, Aron's father.Kate Burton as Donna Ralston, Aron's mother.Lizzy Caplan as Sonja Ralston, Aron's younger sister.Clémence Poésy as Rana, Aron Ralston's lover.Years later after the accident, Ralston starts a family, continues climbing and always leaves a note saying where he has gone. He meets a family on a hike, who alert the authorities, and a Utah Highway Patrol helicopter brings him to a hospital. He then rappels down a 65-foot rockface using his other arm and drinks rainwater from a pond. He wraps the stump to prevent exsanguination, and takes a picture of the boulder. Using the pocket knife, he slowly amputates his arm. Using his knowledge of torque, Ralston fashions a tourniquet from CamelBak tube insulation and uses a carabiner to tighten it before breaking the bones in his arm. During one hallucination, he realizes that his mistake was that he did not tell anyone where he was going, and decides that destiny has trapped him with the boulder. He hallucinates about escape, relationships, and past experiences including a former lover, family, and Kristi and Megan. In his videos, he becomes desperate and depressed. With no water available, he is forced to drink his urine. Over the next five days, Ralston tries using his pocket knife to cut himself free, but the blade is too dull to cut bone.

He sets up a pulley using his climbing rope in a futile attempt to lift the boulder.

He rations his food and water in order to survive the ordeal. Ralston begins recording a video diary to maintain morale as he chips away parts of the boulder in an attempt to free himself and tries to keep warm at night. He calls for help but realizes that he is all alone. While climbing in a canyon, he slips and falls, knocking a boulder loose which falls and crushes his right hand and wrist against the wall. After swimming, Aron parts ways with the hikers, and continues through a slot canyon in Blue John Canyon. He befriends hikers Kristi and Megan, and shows them an underground pool. In April 2003, mountaineer Aron Ralston goes hiking at Utah's Canyonlands National Park.

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