The death toll from a gas explosion that caused the collapse of a tunnel at a hydroelectric power project in India's northeastern state of Sikkim has increased to 20, rescue officials said on Tuesday.
According to the Sikkim State Disaster Management Authority, 25 workers were trapped inside the tunnel after the blast. Rescue teams have recovered 13 bodies, while several more victims have been located but remain unreachable due to severe flooding and dangerous methane gas inside the collapsed tunnel.
Officials say the hazardous conditions have made rescue efforts extremely difficult, with hopes of finding survivors fading.
The tunnel is part of a 500-megawatt hydropower project being developed by the state-owned National Hydroelectric Power Corporation (NHPC). The company said the collapse was caused by an explosive release of suspected methane gas trapped within underground rock formations, producing dense smoke and toxic gases.
NHPC has announced that a full investigation will be carried out to determine the exact cause of the disaster.
Heavy monsoon rains in the region have further complicated recovery operations. Experts have long warned that rapid infrastructure development in the geologically fragile Himalayan region increases the risk of such accidents due to unstable rock formations and seismic activity.
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