This is where the flash superflood on the Nepal-Tibet border today first began. From an altitude of 17,000 ft on Langtang Lirung in the Himalayas, a ~2,000 ft-wide chunk of glacier ice snapped off and fell ~4,000 ft to the valley below, generating an impact 6.3% as powerful as the Hiroshima nuclear explosion and causing a Magnitude 5.2 seismic event. Upon impact, this massive ice chunk was then pulverized into a violent 100+ ft-tall surge of glacier water, rocks, and mud that flowed into the nearby Trishuli River. Funneled by Nepal’s extremely steep and jagged terrain, the resulting flood wave became an unsurvivable wall of water and debris for the immediate communities downstream.