Aron Ralston did fall and become trapped by a boulder while canyoneering in Blue John Canyon, Utah. This is the central event of both the film and his autobiography.

Ralston was trapped for approximately 127 hours (5 days and 7 hours), as the title accurately reflects.

Ralston had minimal food, water, and equipment with him, as depicted in the film. This contributed to the severity of his situation.

Ralston documented his experience with a video camera, leaving messages for his family. The film uses these as a narrative device.

Under duress and facing dehydration, Ralston likely experienced hallucinations and vivid memories, as portrayed in the film.

This is the most dramatic and accurate aspect. Ralston was forced to amputate his own arm with a multi-tool to escape.

Weakened and injured, Ralston had to rappel down a cliff face after freeing himself, a feat accurately shown in the film.

The film adds a fictional encounter with a family to create dramatic tension. Ralston was alone during his ordeal.

While the specific details are uncertain, Ralston likely reflected on past experiences, as the film suggests.

Facing death and extreme isolation, Ralston likely experienced a range of intense emotions, as portrayed in the film.

Ralston was eventually discovered and rescued by a helicopter crew, ending his ordeal.

The film realistically portrays the physical toll of dehydration, injury, and amputation, as well as the psychological impact of isolation and trauma.

127 Hours' is considered a highly accurate depiction of Ralston's experience. Ralston himself has praised the film's authenticity.