About 16 Nepali workers and Chinese nationals were trapped inside the tunnel of Upper Madi hydropower project in Kaski district, about 125 kilometres from the capital, after a mudslide blocked its entrance, police spokesperson Ganesh K C said.
Officials have been deployed to rescue those trapped inside the tunnel. Contact has been established with 13 of the trapped workers and they are reported to be safe.
A team of officials from Nepal Police and Nepal Army has opened a passageway by creating a duct through the fallen earth to provide water to the trapped workers.
The hydropower project, the first build-operate-transfer hydropower project invested by a Chinese firm in Nepal, would generate 25 MW of power in the energy-deficit country.