On October 9, 1963, a massive landslide slammed into a dam reservoir, unleashing a six-billion-gallon wall of water onto the unsuspecting village of Longarone, Italy. In less than five terrifying minutes, over 1,500 people were killed and a town was reduced to little more than mud and rubble. Revisit the 1963 Vajont Dam tragedy, one of the world's worst man-made disasters in history, through the firsthand accounts of those swept up in the calamity.