India, Nov. 9 -- A rock mass collapsed at the construction site of Pakistan's Tarbela 5th Extension hydropower project on Monday, November 9, sending water from an intake pit into an under-construction tunnel and powerhouse area and forcing the evacuation of workers, the Water and Power Development Authority (Wapda) said.

The collapse occurred during excavation of the 2nd Bench Connecting Tunnel, Wapda said in a statement. An emergency was declared, construction was suspended and workers were moved to safer areas. "All workers were immediately evacuated safely," the authority said, adding that there were no casualties.

Wapda said the water from the intake pit had been completely drained out with no further water entering downstream work...