Full Breakdown
Methane Explosion Halts Rescue of Workers in Sikkim Hydropower Tunnel
7/23/2026, 12:22:26 AM
Core Event
On July 21, 2026, rescuers reported that 13 workers remained trapped after a tunnel collapse at the 500-megawatt Teesta Hydroelectric Project in Sikkim’s Namchi district. The collapse followed a methane-gas explosion that killed 12 workers the previous Monday. Toxic gas and water buildup have prevented rescue teams, equipped with breathing apparatus and night-vision gear, from entering the tunnel.
Background & Context
The Teesta River basin lies in a seismically active Himalayan region characterized by young, fragile rock formations with fractures that can trap ancient gases. Experts note that such geological conditions make underground tunnelling especially hazardous. The incident follows a February methane explosion in a coal mine in neighboring Meghalaya that killed 18 workers, and a 2023 tunnel collapse in Uttarakhand that trapped 41 workers for 17 days.
Data & Statistics
- Project capacity: 500 MW.
- Distance from state capital Gangtok: ? 40 km (about 25 mi).
- Workers originally in the tunnel: 25 (NHPC statement).
- Confirmed deaths: 12.
- Workers still trapped: 13.
- Identified deceased workers: 7 (three from West Bengal, one each from Sikkim, Uttarakhand, and the remainder from Assam).
Official Statements & Responses
- Anupa Tamling, District Magistrate of Namchi, told *The Hindu* that “twelve people have died so far. Rescue operations for the others are underway.”
- Chief Minister Tamang, accompanied by Governor Om Prakash Mathur, inspected the site and announced the formation of a high-level inquiry committee to determine the cause.
Verbatim Quotes
- “Twelve people have died so far. Rescue operations for the others are underway,” — Anupa Tamling, administrative official
On-the-Ground Reports
Gandura Oraon, 38, recounted that workers were eating lunch when a loud explosion forced them to flee. Oraon added that their supervisor chose to return toward the blast site and was later found dead.
Conflicting Reports & Gaps
- The district magistrate’s name appears as Anupama Tamling in some reports and Anupa Tamling in others, indicating inconsistent spelling across outlets.
- While the NHCP initially reported 25 personnel were trapped, later statements focus on 13 workers still missing, leaving the status of the remaining individuals unclear.
What’s Next
State authorities will convene a high-level inquiry committee to investigate the cause of the methane release. Rescue teams continue to use specialized breathing equipment to reach the trapped workers, pending improvements in tunnel ventilation and water removal.
