About 900 workers are missing from 12 hydropower projects in Nepal, with roughly 500 believed to be trapped in tunnels, according to local authorities.

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

Rescue teams in Nepal were still searching Wednesday for hundreds of workers believed to have been trapped inside sprawling hydropower tunnels since the catastrophic flash flood…

At least 557 workers are missing from a hydropower project along the Trishuli River, with about 115 still believed to be trapped.