A flood caused by a glacier collapse in Nepal's Trishuli valley killed more than 1,200 people and left over 4,000 missing as of Monday. ^[1] A WhatsApp group established by engineers before the disaster is now being used to guide rescue workers searching for survivors in tunnels of hydropower plants devastated by flash floods in Nepal. ^[2] A government official requested layout drawings for the Chilime hydropower plant on the WhatsApp group, and a member responded with details of access tunnels. ^[3] An official at the Nepal Electricity Authority said 46 people may be trapped at the Rasuwagadhi hydropower plant. ^[4] The Nepal Independent Power Producers' Association stated on Monday that at least eight people could be trapped at the Chilime plant. ^[5] Authorities report that at least 900 people are missing from six hydropower plants, at least three of which were under construction when the flood occurred. ^[6] The flood deposited approximately 2.2 million tonnes of mud and debris down the Trishuli valley, making it difficult to find entrances to the tunnels. ^[7]