Aron Ralston was caught in Blue John Canyon between a rock and the cliff.  He had to cut his hand off to escape.  The approximate location of the accident is here but it needs to be more precisely identified although the position here is close.

Aron Ralston

Aron Lee Ralston (born October 27, 1975) is an American outdoorsman, engineer and motivational speaker.

• http://en.wikipedia.org/wiki/Aron Ralston
• http://www.utah.com/sanrafael/blue_john_canyon.htm