Rescue agencies began drilling through the debris in the Tapovan tunnel to establish contact with the over 30 people trapped inside after a flash flood, an operation which stalled briefly Thursday when the Dhauliganga river began swelling again.
The confirmed death toll in the Uttarakhand disaster rose to 36 with the recovery of two more bodies along the riverbank and 168 people remain missing since Sunday, after an avalanche or a glacier break triggered a surge of water in the Alaknanda river system.
In an apparent change in strategy, the rescuers are now also focusing on drilling through the hardened debris in the choked tunnel in Chamoli district, rather than just shifting mounds of silt and sludge heaped there by the sudden flood.
The aim for now is to set up a “life-saving system”, possibly to pump oxygen into the blocked tunnel.
The Indo-Tibetan Border Police (ITBP), the National Disaster Response Force (NDRF), the State Disaster Response Force (SDRF) and the Army are part of the multi-agency rescue effort, which continues even as hopes of finding the trapped workers alive recede with each passing hour.
On Thursday afternoon, there was another scare when the water of the Dhauliganga – a tributary of the Alaknanda – began rising again.
Rescue workers at the Tapovan site scrambled to safety, pulling their heavy machinery to higher ground. A press briefing ended midway and the operation halted.
It resumed after 45 minutes with cautious officials saying they will send in only small teams to the rescue site for now. Barricades were now put up to prevent people from coming too close to the tunnel, which runs parallel to the river.
The centre of the rescue operation remains the 1.5-km "head-race tunnel" -- a part of the 2.5-km long network of tunnels -- at the 480-MW Tapovan-Vishnugad hydel power project of the National Thermal Power Corporation (NTPC).
Rescuers began the drilling in the early hours of Thursday.