At least 22 construction workers died after a tunnel collapse at the NHPC Teesta Stage VI Hydropower Project in Namchi district, Sikkim [1].
The disaster highlights the extreme risks associated with large-scale hydropower infrastructure in the Himalayas, where geological instability and gas pockets can lead to catastrophic failures.
Rescue operations continued this week as teams worked to locate missing personnel. A total of 27 workers were trapped in the tunnel when the collapse occurred [2]. The disaster was triggered by a suspected methane gas explosion, which caused the structural failure of the tunnel [1, 2].
Reports on the casualties vary as recovery efforts proceed. One report said the death toll reached 22 [1], noting that nine additional bodies were recovered overnight [1]. However, a separate report placed the death toll at 25 [3], saying that 13 bodies had been recovered [3].
The NHPC Teesta Stage VI project is a critical energy infrastructure site located in the rugged terrain of Sikkim. The suspected presence of methane gas, a highly flammable byproduct of organic decomposition, is being investigated as the primary cause of the blast.
Emergency responders have faced significant challenges reaching the trapped workers due to the depth of the tunnel and the instability of the surrounding rock. The recovery of the bodies remains the primary focus as officials attempt to reconcile the final number of casualties among the 27 workers involved [2].
“A total of 27 workers were trapped in the tunnel”
The discrepancy in death toll figures between 22 and 25 indicates the volatility of the recovery site and the difficulty of accounting for all personnel in deep-tunnel disasters. This event underscores the critical need for advanced gas detection and structural monitoring in Himalayan hydropower projects to prevent methane-induced explosions.
