A 500-strong WhatsApp group of engineers is helping Nepal rescuers search hydropower tunnels buried by the Aug 26 flash flood. About 900 people are reported missing from six hydropower plants.

Nepal’s National Disaster Risk Reduction and Management Authority had estimated 639 people to be missing at these hydropower sites. | India News

Tunnel expert Arnold Dix says large underground areas may have sheltered workers from the devastation, as rescue work continues in hydropower sites.