The Great Molasses Flood

The Science of..: Scientific American: More than 7.5 million liters of molasses surged through Boston's North End at around 55 kilometers per hour in a wave about 7.5 meters high and 50 meters wide at its peak. All that thick syrup ripped apart the cylindrical tank that once held it, throwing slivers of steel and large rivets in all directions. The deluge crushed freight cars, tore Engine 31 firehouse from its foundation and, when it reached an elevated railway on Atlantic Avenue, nearly lifted a train right off the tracks. A chest-deep river of molasses stretched from the base of the tank about 90 meters into the streets. From there, it thinned out into a coating one half to one meter deep. People, horses and dogs caught in the mess struggled to escape, only sinking further.