A rescue operation was launched after a sudden rush of water and debris entered the tunnel at the Vishnugad-Pipalkoti hydroelectric project in India's Uttarakhand state.

A rescue operation was launched after a sudden rush of water and debris entered the tunnel at the Vishnugad-Pipalkoti hydroelectric project in India's Uttarakhand state.

Officials say an under-construction tunnel has collapsed at a hydropower project in India’s northern hill state of Uttarakhand, leaving at least seven workers dead.