Ten workers have died and 15 remain trapped after a suspected gas leak triggered a blast and tunnel collapse at a hydroelectric project in India's Sikkim state on Tuesday.
Authorities described the survival chances for those underground as slim, noting that rescuers are struggling to navigate toxic fumes that have complicated recovery operations.
The incident has drawn attention to safety protocols at major infrastructure sites in the Himalayan region.
While the immediate impact on energy markets is limited, the event underscores the operational risks associated with tunneling and hydroelectric construction in geologically sensitive areas.
State disaster management official Rajiv Roka confirmed the death toll and the ongoing difficulties faced by rescue teams.
The project is linked to NHPC, a key player in India's power sector.