EnvironmentDisaster Management
News 11 of 21

NHPC Teesta Stage-VI Tunnel Accident in Sikkim: 15 Dead Due to Methane Burst, Raises Questions on Himalayan Project Safety

Target:UPSC GS-IIIMPSCTeachingSSC GAPrelims HighMains HighStatic GK Link
22 Jul 2026
~2 min
Source: The Hindu
Key Data:15 workers killed25 workers estimated in tunnel2023 glacial lake outburstTeesta Stage-VINHPC Limited
Bodies:NHPC Limited
Practice MCQs from today's news ▸
What This Article Covers

1.Methane burst at NHPC's Teesta Stage-VI tunnel in Sikkim kills at least 15 workers; rescue operations ongoing.

2.The Teesta basin is seismically active with fractured rock, making methane pockets a known hazard in underground excavation.

3.The tragedy highlights the tension between hydropower development and environmental safety in the Himalayas, raising questions on risk assessment and clearance compliance.

The Big Picture
Prelims · HighMains · High

At least 15 workers died in a methane gas burst at NHPC's under-construction Teesta Stage-VI hydroelectric tunnel in Sikkim. The incident underscores the heightened risks of infrastructure projects in the ecologically fragile Himalayan region, where previous disasters like the 2023 glacial lake outburst have occurred. The government must conduct an independent review of environmental clearance compliance.

Exam Lens

Quick Exam Facts From News

LocationTeesta Stage-VI, Namchi district, Sikkim
FatalitiesAt least 15 workers
Project OwnerNHPC Limited (formerly National Hydroelectric Power Corporation)
Previous Disaster2023 glacial lake outburst destroyed Teesta-III dam, killed 100+

1-Minute Revision

  • ›Location: Teesta Stage-VI, Namchi district, Sikkim
  • ›Fatalities: At least 15 workers
  • ›Target this Data: At least 15 workers killed, 25 workers estimated in tunnel
  • ›Target this Nodal Body: NHPC Limited (formerly National Hydroelectric Power Corporation)
  • ›Target this Legal Point: Environmental Clearance conditions under the Environment Protection Act, 1986

Mastered this topic? Test your knowledge with a full MCQ quiz.

Practice exam-style questions, track your score, and strengthen your recall.

Q1Static LinkageEasy

Which public sector undertaking is responsible for the Teesta Stage-VI hydroelectric project mentioned in the news?

Q2Statement-basedHard

Consider the following statements regarding the Sikkim tunnel accident:

1. The tunnel accident was caused by a methane gas burst during excavation.

2. The Teesta basin is located in a seismically inactive zone.

3. In 2023, a glacial lake outburst flood destroyed the Teesta-III dam and killed over 100 people.

Which of the statements given above is/are correct?

Q3Data-centricMedium

How many workers were killed in the Sikkim tunnel accident according to the article?

Q4Application/ImpactMedium

What is the primary concern raised by the article regarding infrastructure projects in the Himalayan region?

All 15 MCQs ▸
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