Within days of filling its reservoir, the Teton Dam began to leak. Bulldozers that were sent to plug the leaks were instead swallowed up by a growing sinkhole. By the end of the day the dam had been breached and the reservoir poured down the Teton valley in a tidal wave. Explore the potentially catastrophic effects of water moving through soil under pressure—whether in dams and levees or in the liquefaction caused by earthquakes.