<P> After running out of food and water on the fifth day , Ralston decided to drink his own urine . He carved his name , date of birth and presumed date of death into the sandstone canyon wall , and videotaped his last goodbyes to his family . He did not expect to survive the night . After waking at dawn the following day he had an epiphany that he could break his radius and ulna bones using torque against his trapped arm . He did so , then amputated his forearm in about one hour , with his multi-tool , which included a dull two - inch knife . The manufacturer of the tool was never named , but Ralston said `` it was not a Leatherman but what you 'd get if you bought a $15 flashlight and got a free multi use tool . '' </P>
<P> After running out of food and water on the fifth day , Ralston decided to drink his own urine . He carved his name , date of birth and presumed date of death into the sandstone canyon wall , and videotaped his last goodbyes to his family . He did not expect to survive the night . After waking at dawn the following day he had an epiphany that he could break his radius and ulna bones using torque against his trapped arm . He did so , then amputated his forearm in about one hour , with his multi-tool , which included a dull two - inch knife . The manufacturer of the tool was never named , but Ralston said `` it was not a Leatherman but what you 'd get if you bought a $15 flashlight and got a free multi use tool . '' </P>
how does he cut his arm off in 127 hours
how does he cut his arm off in 127 hours
with his multi-tool
with his multi-tool