American filmmaker, Dan Wooley, was trapped for 65 hours under rubble from the Haitian earthquake. Apparently he used the flash from his digital camera for light and an app on his iPhone to find the best way to treat his multiple injuries. Using the app he diagnosed his broken foot and how to make a tourniquet for his leg. The app also showed him how to best bandage his head wound to stop bleeding. Finally he used his the alarm clock on the iPhone to go off every 20 minutes to keep him awake and alert. 

After 65 hours he was rescued. He must have done some serious battery management or maybe he had an extended battery or a battery case for his iPhone. This is a great use of mobile technology. Thank God he was rescued.