He took refuge in an elevator shaft, where he followed instructions from an iPhone first-aid app to fashion a bandage and tourniquet for his leg and to stop the bleeding from his head wound, according to an MSNBC story.

The app even warned Woolley not to fall asleep if he felt he was going into shock, so he set his cellphone’s alarm clock to go off every 20 minutes. Sixty-five hours later, a French rescue team saved him.