Stories abound across the Internet of earthquake survivors living weeks or even months trapped in the ruins of buildings. When an earthquake struck Haiti in 2010 and killed at least 200,000 people, a man survived trapped in the rubble for almost two weeks in the ruins of a store repeatedly visited by looters. That’s one week longer than the typical UN search and rescue mission. Even amidst these inspiring stories of survival, though, the fact remains: every moment is critical in finding survivors before time runs out. There is no time for guesswork.