Water Enters Under-Construction Powerhouse at Tarbela 5th Extension Project After Tunnel Collapse

A section of weak rock mass collapsed during excavation work at the Tarbela 5th Extension Hydropower Project on November 9, 2026, allowing water from the Intake Pit to enter the connecting tunnel and the under-construction powerhouse area.

According to WAPDA, the incident occurred during excavation of the 2nd Bench Connecting Tunnel. All workers were immediately evacuated safely, with no injuries or loss of life reported.

WAPDA said water from the Intake Pit has been completely drained and no further water is entering the downstream construction sites. Dewatering operations at the under-construction powerhouse have also commenced.

Senior WAPDA officials, along with the project engineer and contractor, are assessing the situation to address any potential challenges to the T-5 project.

Clarifying reports circulating about the incident, WAPDA said claims of the collapse of the main T-5 tunnel were incorrect.

It further clarified that there has been no damage to the main tunnel, under-construction powerhouse, tailrace culvert or switchyard.

WAPDA reiterated that all workers remain safe and that no casualties or injuries have been reported.