At least nine workers have died and several others remain trapped after a tunnel under construction collapsed in the northeastern Indian state of Sikkim, with rescue efforts being slowed by a hazardous gas leak inside the site.
According to Indian authorities, the collapse occurred at a tunnel construction project in Mangan district, where dozens of workers were on duty when part of the structure gave way. Emergency officials said rescuers have recovered nine bodies, while efforts to reach those still trapped remain ongoing.
Rescue operations have been complicated by the presence of toxic gas inside the tunnel, forcing emergency teams to suspend work intermittently while ventilation systems are deployed to improve air quality. Officials said specialist rescue personnel equipped with protective gear have been brought in to assist with the operation.
Authorities have not yet confirmed the cause of the collapse, although an investigation has been launched to determine whether geological conditions, construction practices or equipment failure contributed to the incident. Engineers are also assessing the structural stability of the remaining tunnel before expanding rescue efforts.
The incident has renewed concerns over safety standards at large infrastructure projects in India’s mountainous Himalayan region, where challenging terrain and unstable geology can increase construction risks. Local officials said support is being provided to the families of the victims, while medical teams remain on standby for any survivors recovered from the site.
Rescue operations are expected to continue around the clock as emergency responders work to locate the remaining workers and secure the tunnel. Authorities said updates will be released as more information becomes available.
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