Workers Trapped After Blast at Sikkim Hydropower Tunnel Rescue teams are battling hazardous gas, low oxygen, and blocked passages at the Samardung tunnel in Sikkim. The incident occurred at the under-construction Teesta Stage VI Hydroelectric Project in Namchi district.   Hazardous Gas Slows Rescue Teams in Namchi A major Samardung tunnel rescue operation continued in Sikkim’s Namchi district on Tuesday, July 21, 2026, after