**Title: Tunnel Collapse at Sikkim Hydropower Project Claims 10 Lives, 17 Missing**
**Date: July 21, 2026**
A tragic incident occurred at a hydropower project in the northeastern Indian state of Sikkim, where a suspected gas explosion led to the collapse of an under-construction tunnel, resulting in the deaths of at least 10 workers and leaving 17 others unaccounted for. The explosion took place on Monday in Samardung village, located near the borders of Bhutan and Tibet in the Himalayan region.
The incident unfolded during construction activities for a 500-megawatt hydropower project being developed by the state-owned National Hydroelectric Power Corporation (NHPC) on the Teesta River. Eyewitness accounts indicate that workers heard a loud explosion before debris fell, trapping many inside the tunnel.
According to NHPC officials, the explosion was likely caused by a sudden release of methane gas that had been trapped in the rocks within the tunnel. As the news of the disaster spread, a group of six NHPC officials entered the tunnel to assist with rescue operations, but they too became trapped.
Local police chief Sonam Dolma confirmed the grim toll, stating, "We have recovered 10 bodies so far, and 17 others are feared trapped." Rescue operations have been complicated by hazardous conditions inside the tunnel, where toxic gases, including methane, carbon monoxide, and hydrogen sulfide, have accumulated. Nitin Kumar, an official from the National Disaster Response Force (NDRF), reported that rescuers are equipped with specialized breathing apparatus to navigate the dangerous environment as they search for survivors.
The challenges faced by rescue teams highlight the inherent risks associated with construction projects in the Himalayan region, which is known for its seismic activity and unpredictable geological conditions. Accidents of this nature are not uncommon in India, particularly in areas where construction involves tunneling through fragile rock formations.
In a similar incident earlier this year, 41 workers were trapped for 17 days after a section of a tunnel collapsed in Uttarakhand state, underscoring the dangers associated with such projects. Experts have noted that the Teesta River basin, where the current hydropower project is situated, is particularly susceptible to geological hazards due to its young and fractured rock formations, which can create pockets that trap gases, leading to potential explosions.
As rescue efforts continue, the focus remains on locating the missing workers and ensuring the safety of the rescue teams operating in the hazardous conditions of the tunnel. The incident has raised concerns about workplace safety standards in India's construction sector, particularly in regions prone to natural hazards.
Officials are expected to conduct a thorough investigation into the circumstances surrounding the explosion and the subsequent tunnel collapse, with an emphasis on preventing similar tragedies in the future.