An army of experts in a WhatsApp group is guiding rescue workers scouring a Nepali valley after a massive flash flood more than a week ago, as they desperately search for anyone who may still be alive inside the tunnels of devastated hydropower plants.The messaging group was set up by engineers before the wall of water, mud ​and rock crashed down the Trishuli valley in Nepal on August 26. It has since become a valuable tool alongside helicopters and heavy ⁠machinery in the race to find survivors.The authorities hope some of the about 900 people reported missing from six hydropower plants — at least three of which were under construction — may have escaped the deluge because they worked in or fled into the tunnels.In a first sign of success, two people were brought out alive from a tunnel linked to the Upper ‌Trishuli 3A hydropower plant on Friday, nine days after the disaster, a lawmaker said.Nepal flash floods aftermath LIVE - September 4, 2026Even finding entrances to some of the tunnels, which were designed to channel water or used to access hydropower facilities, is tough now after the flood deposited 2.2 million tonnes of mud and debris down ‌the valley.‘Send me layout drawings’“Can you send me Chilime layout drawings,” a government official wrote on the engineers’ WhatsApp group on Saturday as rescue workers ‌searched ⁠the buried remains of the Chilime hydropower plant high in the Himalayan valley close to the Chinese border.Minutes afterwards, a member of the ⁠group chat, which was expanded to add more experts in support of the rescue effort, responded by sending drawings of the project’s powerhouse, as well as details of access tunnels.