Buried questions: On the Sikkim tunnel accident
A methane gas explosion at an NHPC hydroelectric project in Sikkim, India, has resulted in at least 15 deaths, raising serious questions about safety protocols in Himalayan infrastructure projects. The incident underscores the recurring dangers of tunneling in seismically active and geologically fragile terrain.
Why it matters
The tragedy highlights the human and environmental costs of rapid industrial development in the Himalayas and the need for stricter safety and geological risk assessments.
India is grappling with another Himalayan tragedy. Workers in an under-construction tunnel at the Teesta Stage-VI hydroelectric project of NHPC Limited (formerly National Hydroelectric Power Corporation Private Ltd.), in Sikkim’s Namchi district, struck a pocket of suspected trapped methane. The resulting burst partially damaged the tunnel, killing at least 15 of an estimated 25 workers, with rescue operations still under way. The NHPC has announced a detailed investigation. Methane is a well-recognised hazard in underground excavation, and the geology of the Teesta basin makes it a likely one. The basin sits in a seismically active zone, with young and heavily fractured rock, and where compressed pockets of gas laid down long ago can lie hidden until an excavation breaks into them. The presence of the gas, in that sense, is not in itself surprising.
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