A WhatsApp group of more than 500 engineers has become a critical coordination tool in Nepal’s flood disaster response. According to Reuters, the group is helping rescuers access real-time tunnel layouts and survivor leads as they search devastated hydropower plants. More than a week after a glacial flood tore through the Trishuli valley, this improvised digital channel is doing work formal emergency systems couldn't keep up with.

The August 26 flood caused widespread destruction across Nepal, damaging six hydropower sites and leaving more than 1,200 people dead. It also buried critical information rescuers needed to navigate the sites, including tunnel maps, access routes and structural drawings, under millions of tonnes of mud and rock.

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With much of this information no longer accessible, engineers began rebuilding it from their own knowledge and records, using a WhatsApp group to share vital details with rescue teams.

A Grassroots Engineering Network

The WhatsApp group actually predates the disaster. A handful of hydropower engineers set it up long before anyone imagined they would need it for this, and in the days since, it's quietly grown into something much bigger. It has become an informal channel connecting officials, military personnel, former plant staff and technical experts.

The way it works is almost touchingly simple. Someone asks for something specific, like layout drawings for the Chilime plant, and within minutes a stranger or a former colleague sends over powerhouse schematics and access-tunnel details, just because they happen to have them and someone needs them. Multiply that small act of help by dozens of requests a day, and the group has become a living, crowdsourced engineering archive for a site where the paper records are simply gone.

Former plant employees have logged on too, drawing on memory alone to guide search teams through tunnels they once knew by heart. Others have shared the names and phone numbers of missing workers, hoping officials can use them to ask telecom providers for a last known location - a small, human effort to help families get an answer.

Why the Usual Tools Fell Short

The scale of the disaster helps explain why the WhatsApp group became so important. Around 900 people were reported missing across six hydropower plants, three of which were still being built. Rescue teams believed some workers may have survived by sheltering inside tunnels.

But the tunnels were no longer the same as they were before the flood. Mud and rock had buried entrances, blocked passages and changed the structure of some tunnels. This meant rescue teams could not rely entirely on old maps and plans to find their way through.

At the Rasuwagadhi plant, rescuers made it 250 metres into a tunnel before a blockage stopped them. They were still searching for up to 46 people who may have been trapped in a chamber where food and water could be available.

At the Upper Trishuli 3A plant, crews took almost six days to reach a buried tunnel entrance. They then pumped oxygen into areas where people might be trapped. Nine days after the flood, rescuers pulled two survivors from the site. One later said there could still be other people alive inside.

This is where the engineers' WhatsApp network became valuable. The situation was changing too quickly for old disaster plans and databases to provide all the answers. Engineers and former plant workers could share detailed knowledge of the tunnels, access points and plant layouts in real time, giving rescue teams information that might otherwise have been difficult to find.

What It Means for Crisis Tech

Nepal’s flood response shows how important it is to have information that can be shared quickly during a crisis. When tunnels, buildings and records were buried, engineers became one of the most important sources of information. WhatsApp gave them a simple way to share that knowledge with rescue teams in real time. This is also relevant for companies building digital tools for critical infrastructure. Digital twins, asset management systems and emergency software need to be easy to update and share when conditions change. WhatsApp is not a replacement for proper emergency systems, but its use in Nepal shows how valuable fast access to information can be during a disaster. The flood destroyed around 10 per cent of Nepal’s power generation capacity, while more than 4,000 people remain missing. The search continues, and so does the WhatsApp group helping support it.