Tunnel Collapse at Sikkim Hydro Project Leaves Multiple Dead, Rescue Hampered by Toxic Gas
Published on 07/22/2026 at 19:28 | Redaktion boerse-global.de
Rescue operations at the Teesta Stage VI hydroelectric project in Sikkim, India, have been severely hampered by toxic gas and hazardous conditions following a major tunnel collapse earlier this week. The incident, which occurred on July 20, 2026, at the 500-MW facility under construction, is believed to have been triggered by a methane gas explosion approximately 1.5 kilometres inside the tunnel. Multiple workers have been killed, with several others still trapped — a stark reminder of the risks facing large-scale infrastructure projects in geologically challenging environments.
Toxic Gas Forces Rescue Teams into 15-Minute Shifts
As of July 22, emergency teams from the National Disaster Response Force (NDRF), the State Disaster Response Force (SDRF), and mining experts continue to battle lethal conditions. Monitoring equipment has detected dangerous levels of methane, carbon monoxide, and hydrogen sulfide, forcing rescuers to operate in 15-minute shifts using breathing apparatus and night-vision gear.
The rescue mission is further complicated by a buildup of mud and water inside the tunnel. Teams are focusing on a 200-metre zone where the remaining workers are believed to be trapped. While two labourers managed to escape the initial blast, several NHPC officials who entered the tunnel during the initial response also became trapped.
Incidents involving hazardous substances in confined spaces highlight how quickly workplace risks can escalate. A free COSHH toolkit provides assessment templates and control checklists to help you document dangerous materials and protect your team. Get the free COSHH Toolkit
Death Toll Rises as Recovery Efforts Continue
At least 12 bodies have been recovered as of July 22, though some local reports suggest the total death toll could reach 20 as additional victims are located. The deceased include migrant labourers from several Indian states, including Assam, Punjab, West Bengal, and Uttarakhand.
Preliminary findings suggest that methane gas trapped within the rock formations ignited during drilling activities. Geologists note that the Namchi area of Sikkim contains known coal reserves, which can lead to methane accumulation. Experts have emphasised that the Teesta basin is seismically active with fragile rock structures, making tunnel construction particularly high-risk.
Government and NHPC Announce Compensation
Sikkim Chief Minister Prem Singh Tamang visited the site on July 22 and announced the formation of a special committee to investigate the exact cause of the disaster. The Chief Minister announced an ex gratia payment of Rs 4 lakh for the families of the deceased and Rs 50,000 for those injured. Prime Minister Narendra Modi also pledged Rs 2 lakh for the kin of the victims and assured federal assistance.
NHPC, which acquired the 500-MW project through an insolvency process in 2019, has separately announced compensation of Rs 500,000 for the families of the workers killed in the blast. The incident follows a series of tunnel-related disasters in the Himalayan region over the past several years, raising renewed concerns regarding workplace safety and geological assessments for large-scale hydropower infrastructure.
Disclaimer regarding our articles: No investment advice, no buy or sell recommendation. Information on prices, companies, and markets is provided without guarantee; changes are possible at any time. Stock market transactions can lead to substantial losses. Our articles are created and reviewed in whole or in part automatically with the support of AI.
