James Franco is taking us to new heights in the trailer for his upcoming movie 127 Hours.

The film is based on the true story of Aron Ralston, a fearless mountain climber who gets stuck after a fallen boulder crashes on his arm ... trapping him for 127 hours in a remote canyon in Utah. His survival story, and self-amputation, made headlines back in 2003.

Danny Boyle, who directed Slumdog Millionaire, is directing Franco in 127 Hours.

Looks intense!