On August 26, a section of glacier collapsed at an altitude of more than 5,000 metres on the Nepalese side of the Himalayas. The falling ice and rock accelerated down a steep valley at about 50 metres per second, scouring debris and transforming into a high-speed mudslide that slammed into Gyirong Port on the Chinese side just seven minutes later. The force of the flow largely buried and obliterated the border facilities. Hundreds of people, many of them travellers, remain missing on the Chinese...