A suspected gas explosion collapses part of a tunnel under construction at a hydropower project in India’s northeastern Himalayan state of Sikkim near the Chinese border, killing at least 10 workers and leaving others missing, according to officials and media reports citing local authorities. Reported death and missing figures vary by outlet: some sources cite 10 dead with 17 missing, while others report higher counts, including 11 dead with 14 missing and 12 dead with 13 missing. State Chief Minister Prem Singh Tamang visits the site and says the blast is triggered by a build-up of methane gas. The explosion occurs on Monday in the tunnel near Samardung village, about 40 km from Gangtok, where workers are carrying out construction on the Teesta hydroelectric project, a 500-megawatt scheme. Multiple reports say rescuers have difficulty reaching those trapped due to hazardous conditions inside the damaged tunnel. Some workers escape, while several others are trapped, including some who reportedly enter the tunnel to help with rescue efforts after the blast. Survivors describe hearing a loud explosion followed by debris falling into the tunnel.