The Hindu Editorial • July 23, 2026 • Read Original

Buried questions: on the Sikkim tunnel accident

The costs of projects in environmentally fragile zones are many

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The Hindu Read Original

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Analysis of editorial from The Hindu newspaper on July 23, 2026

Buried questions: on the Sikkim tunnel accident

The costs of projects in environmentally fragile zones are many

Teesta Hydroelectric ProjectNHPCSikkim Tunnel AccidentHimalayan EcologyDisaster Management

Sentences

Sentence 1 of 17

English Original

India is grappling with another Himalayan tragedy.

Sentence Breakdown

Part 1

India is grappling

India is struggling to deal

Part 2

with another Himalayan .

With yet another disastrous event in the Himalayan region.

Sentence 2 of 17

English Original

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.

Sentence Breakdown

Part 1

Workers in an under-construction tunnel

Laborers working inside a tunnel that is still being built

Part 2

at the Teesta Stage-VI of NHPC Limited (formerly National Hydroelectric Power Corporation Private Ltd.),

At the 500 MW water-power electricity plant owned by NHPC Limited,

Part 3

in Sikkim’s Namchi district,

Located in Namchi district in the state of Sikkim,

Part 4

struck a pocket of suspected trapped .

Hit an underground container of likely trapped gas while digging.

Context and Background

Teesta Stage-VI Hydroelectric Project and NHPC

The Teesta Stage-VI project is a 500 MW run-of-river hydropower initiative on the Teesta River in Sikkim’s Namchi district. Originally started by a private developer (Lanco Teesta Hydro Power Ltd), it was taken over in 2019 by NHPC Limited, a public sector enterprise under the Ministry of Power, after the private firm faced insolvency.

Sentence 3 of 17

English Original

The resulting burst partially damaged the tunnel, killing at least 15 of an estimated 25 workers, with rescue operations still under way.

Sentence Breakdown

Part 1

The resulting

The sudden gas explosion caused by hitting the gas pocket

Part 2

partially damaged the tunnel,

Broke or destroyed part of the tunnel structure,

Part 3

killing at least 15 of an estimated 25 workers,

Causing the death of minimum 15 workers out of around 25 believed to be inside,

Part 4

with rescue operations still .

While efforts to save the trapped workers are still currently happening.

Sentence 4 of 17

English Original

The NHPC has announced a detailed investigation.

Sentence Breakdown

Part 1

The

The National Hydroelectric Power Corporation (NHPC Limited)

Part 2

has announced a detailed investigation.

Has officially stated that it will conduct a thorough inquiry into the accident.

Sentence 5 of 17

English Original

Methane is a well-recognised hazard in underground excavation, and the geology of the Teesta basin makes it a likely one.

Sentence Breakdown

Part 1

Methane is a well-recognised in underground ,

Methane gas is a widely known danger during subterranean digging or tunneling,

Part 2

and the of the Teesta

And the natural rock structure and earth formation of the Teesta river valley area

Part 3

makes it a likely one.

Makes methane gas a probable danger in this region.

Context and Background

Methane Gas Hazards in Tunneling

Methane (CH4) is a highly flammable gas that can collect in underground rock cavities. When tunnel excavation exposes trapped methane pockets, any spark from equipment or static electricity can trigger catastrophic fires or gas explosions. Proper atmospheric monitoring and high-volume ventilation are standard safety mandates in underground engineering.

Sentence 6 of 17

English Original

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.

Sentence Breakdown

Part 1

The basin sits in a ,

The river valley lies in an area prone to frequent earthquakes,

Part 2

with young and heavily rock,

Containing geologically recent and severely cracked or broken rock formations,

Part 3

and where pockets of gas laid down long ago

And where trapped, highly pressurized gas pockets formed millions of years ago

Part 4

can lie hidden until an excavation them.

Can remain concealed underground until tunnel digging unexpectedly breaches them.

Sentence 7 of 17

English Original

The presence of the gas, in that sense, is not in itself surprising.

Sentence Breakdown

Part 1

The presence of the gas, in that sense,

The occurrence of methane in this geological environment,

Part 2

is not in itself surprising.

Is not shocking or unexpected on its own.

Sentence 8 of 17

English Original

What remains unclear is far more consequential: the precise circumstances in which the pocket was breached, whether its risk was assessed and modelled during project planning, and whether the gas-detection and ventilation safeguards that such conditions demand were in place and functioning.

Sentence Breakdown

Part 1

What remains unclear is far more :

The things that are still unknown are much more important and significant:

Part 2

the precise circumstances in which the pocket was ,

The exact details and conditions under which the trapped methane pocket was broken open,

Part 3

whether its risk was assessed and modelled during project planning,

Whether the danger of gas accumulation was calculated and simulated before construction began,

Part 4

and whether the gas-detection and

And whether atmospheric gas sensors and air circulation systems

Part 5

that such conditions demand were in place and functioning.

Which are required in such dangerous rock conditions were installed and working properly.

Sentence 9 of 17

English Original

Underground work in India’s difficult terrain has always been perilous.

Sentence Breakdown

Part 1

Underground work in India’s difficult

Subterranean construction and excavation across India’s challenging geographical landscape

Part 2

has always been .

Has consistently been extremely dangerous and risky.

Sentence 10 of 17

English Original

In February this year, an explosion at an illegal coal mine in Meghalaya killed about 30 workers, and in 2023, a stretch of a road tunnel under construction in Uttarakhand collapsed, trapping 41 workers for 17 days before they were pulled out.

Sentence Breakdown

Part 1

In February this year,

In February 2026,

Part 2

an explosion at an illegal coal mine in Meghalaya killed about 30 workers,

A blast inside an unauthorized coal mine in Meghalaya state caused the deaths of nearly 30 laborers,

Part 3

and in 2023, a stretch of a road tunnel under construction in Uttarakhand collapsed,

And in November 2023, a section of a highway tunnel being dug in Uttarakhand caved in,

Part 4

trapping 41 workers for 17 days

Confining 41 construction workers deep underground for 17 straight days

Part 5

before they were pulled out.

Until rescue teams finally extracted them safely.

Context and Background

Major Indian Tunnel and Mining Disasters

This sentence references two major industrial disasters: illegal coal mining in Meghalaya (where unregulated rat-hole mining frequently causes deadly cave-ins and gas explosions), and the November 2023 Silkyara-Barkot tunnel collapse in Uttarakhand, where 41 workers were trapped for 17 days before being rescued through manual auger drilling and rat-hole mining experts.

Sentence 11 of 17

English Original

The circumstances vary, but together they underscore how lethal underground and tunnelling work remains across the country.

Sentence Breakdown

Part 1

The circumstances vary,

The specific causes and conditions of each disaster differ,

Part 2

but together they

But combined, these incidents emphasize and highlight

Part 3

how underground and tunnelling work remains across the country.

How deadly subterranean excavation and tunnel building continue to be throughout India.

Sentence 12 of 17

English Original

A series of hydropower projects along the 400-kilometre stretch of the Teesta that links Sikkim, West Bengal, and Bangladesh have varied histories with environmental clearances but share a common feature — their location in the fragile Himalayan belt.

Sentence Breakdown

Part 1

A series of hydropower projects along the 400-kilometre stretch of the Teesta

Multiple hydroelectric dams built along the 400 km length of the Teesta River

Part 2

that links Sikkim, West Bengal, and Bangladesh

Which flows through Sikkim and West Bengal before entering Bangladesh,

Part 3

have varied histories with

Have different past records of getting official government ecology approvals,

Part 4

but share a common feature — their location in the Himalayan belt.

But all have one key factor in common: being situated in the eco-sensitive Himalayan region.

Context and Background

Teesta River Cascade and Hydro Development

The Teesta River originates in the Eastern Himalayas in Sikkim, flows through West Bengal, and drains into the Jamuna River in Bangladesh. Over a dozen hydropower projects have been planned or built in a cascade fashion along its length. Environmentalists have long warned that high-density dam construction in the eco-fragile, seismic Himalayan belt increases disaster risks.

Sentence 13 of 17

English Original

That vulnerability was demonstrated tragically in October 2023, when a glacial lake outburst flood from the South Lhonak lake destroyed the Teesta-III dam and killed more than a 100 people downstream.

Sentence Breakdown

Part 1

That was demonstrated tragically in October 2023,

That environmental weakness was proven in a painful disaster in October 2023,

Part 2

when a from the South Lhonak lake

When a massive flash flood caused by a breaking glacier lake (South Lhonak Lake)

Part 3

destroyed the Teesta-III dam and killed more than a 100 people downstream.

Washed away the 1,200 MW Chungthang (Teesta-III) dam structure and caused over 100 deaths down the river course.

Context and Background

2023 South Lhonak Lake GLOF Disaster

On October 4, 2023, a Glacial Lake Outburst Flood (GLOF) triggered by heavy rainfall and high-altitude moraine breaches at South Lhonak Lake poured millions of cubic meters of water down the Teesta basin. The sudden surge completely breached the 1,200 MW Teesta-III dam at Chungthang, destroyed downstream bridges, and resulted in over 100 fatalities and missing persons.

Sentence 14 of 17

English Original

Teesta-VI was absorbed by the public-sector NHPC Limited after its private developers, unable to afford escalating costs, went into insolvency.

Sentence Breakdown

Part 1

Teesta-VI was by the NHPC Limited

The Teesta Stage-VI project was taken over by government-owned enterprise NHPC Limited

Part 2

after its private developers, unable to afford costs,

After its original private builders (Lanco Teesta), failing to manage rising expenses,

Part 3

went into .

Became bankrupt and unable to pay back debts.

Context and Background

Acquisition of Teesta Stage-VI by NHPC

The 500 MW Teesta Stage-VI project was initially allocated to Lanco Teesta Hydro Power Ltd. Facing severe cost overruns and financial distress, the private company entered corporate insolvency resolution under the Insolvency and Bankruptcy Code (IBC). In 2019, NHPC Limited acquired the project through NCLT approval for around ₹900 crore to complete construction.

Sentence 15 of 17

English Original

Relief and rescue must remain the immediate priority, and every effort to reach those still trapped is warranted.

Sentence Breakdown

Part 1

Relief and rescue must remain the immediate priority,

Saving lives and providing assistance must be the most urgent focus right now,

Part 2

and every effort to reach those still trapped

And all possible work to save workers currently confined inside the tunnel

Part 3

is .

Is completely justified and necessary.

Sentence 16 of 17

English Original

But once the emergency has passed, the government cannot treat the disaster as an isolated misfortune.

Sentence Breakdown

Part 1

But once the emergency has passed,

However, after the immediate rescue crisis is over,

Part 2

the government cannot treat the disaster

State and central authorities must not handle this tragic incident

Part 3

as an .

As an unavoidable, one-off bad luck event.

Sentence 17 of 17

English Original

It must order a thorough, independent review of whether the conditions attached to the project’s environmental clearance were, in practice, strictly met.

Sentence Breakdown

Part 1

It must order a thorough, independent review

The government must mandate an exhaustive and unbiased investigation

Part 2

of whether the conditions attached to the project’s environmental clearance

To check if the safety and ecological rules stipulated in the project’s green permit

Part 3

were, in practice,

Were actually on the ground and during daily operations,

Part 4

strictly met.

Fully and stringently satisfied or complied with.

Context and Background

Environmental Clearances and Statutory Compliance

In India, infrastructure projects in ecologically sensitive regions require Environmental Clearances (EC) under the Environment Impact Assessment (EIA) Notification from the Ministry of Environment, Forest and Climate Change. These clearances come with strict binding safety, geological hazard modeling, and monitoring conditions. Non-compliance or oversight of these stipulated safeguards carries legal liability under the Environment Protection Act.

Sentence 1 of 17

Sentences Breakdown

Editorial Summary

5-Point Summary

1 A methane gas explosion inside an under-construction tunnel of the Teesta Stage-VI project in Sikkim killed at least 15 workers and left several trapped.
2 Methane build-up is a known danger in the underground rock formations of the seismically active Teesta basin, making gas detection essential.
3 Serious questions remain regarding whether safety precautions, gas monitoring systems, and proper ventilation were operational during tunnel excavation.
4 Recent disasters in Meghalaya and Uttarakhand highlight the persistent lethal risks associated with tunneling and mining in India’s fragile terrain.
5 Once rescue operations conclude, the government must conduct an independent inquiry to determine if project safety and environmental clearance terms were strictly followed.

Tone of the Editorial

Critical

Why this tone?

The editorial criticizes the recurring failures in environmental risk management and safety safeguards during underground construction in the ecologically fragile Himalayan region. It highlights past tragedies like the South Lhonak lake outburst and Uttarakhand tunnel collapse to argue that authorities cannot treat such disasters as mere accidents without holding projects accountable for environmental clearance conditions.

Sentence 1 of 17

India is grappling with another Himalayan tragedy.

Sentence Breakdown

Part 1

India is grappling

India is struggling to deal

Part 2

with another Himalayan tragedy.

With yet another disastrous event in the Himalayan region.

Sentence 2 of 17

Sentence Breakdown

Part 1

Workers in an under-construction tunnel

Laborers working inside a tunnel that is still being built

Part 2

at the Teesta Stage-VI hydroelectric project of NHPC Limited (formerly National Hydroelectric Power Corporation Private Ltd.),

At the 500 MW water-power electricity plant owned by NHPC Limited,

Part 3

in Sikkim’s Namchi district,

Located in Namchi district in the state of Sikkim,

Part 4

struck a pocket of suspected trapped methane.

Hit an underground container of likely trapped gas while digging.

Sentence 3 of 17

The resulting burst partially damaged the tunnel, killing at least 15 of an estimated 25 workers, with rescue operations still under way.

Sentence Breakdown

Part 1

The resulting burst

The sudden gas explosion caused by hitting the gas pocket

Part 2

partially damaged the tunnel,

Broke or destroyed part of the tunnel structure,

Part 3

killing at least 15 of an estimated 25 workers,

Causing the death of minimum 15 workers out of around 25 believed to be inside,

Part 4

with rescue operations still under way.

While efforts to save the trapped workers are still currently happening.

Sentence 4 of 17

The NHPC has announced a detailed investigation.

Sentence Breakdown

Part 1

The NHPC

The National Hydroelectric Power Corporation (NHPC Limited)

Part 2

has announced a detailed investigation.

Has officially stated that it will conduct a thorough inquiry into the accident.

Sentence 5 of 17

Methane is a well-recognised hazard in underground excavation, and the geology of the Teesta basin makes it a likely one.

Sentence Breakdown

Part 1

Methane is a well-recognised hazard in underground excavation,

Methane gas is a widely known danger during subterranean digging or tunneling,

Part 2

and the geology of the Teesta basin

And the natural rock structure and earth formation of the Teesta river valley area

Part 3

makes it a likely one.

Makes methane gas a probable danger in this region.

Sentence 6 of 17

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.

Sentence Breakdown

Part 1

The basin sits in a seismically active zone,

The river valley lies in an area prone to frequent earthquakes,

Part 2

with young and heavily fractured rock,

Containing geologically recent and severely cracked or broken rock formations,

Part 3

and where compressed pockets of gas laid down long ago

And where trapped, highly pressurized gas pockets formed millions of years ago

Part 4

can lie hidden until an excavation breaks into them.

Can remain concealed underground until tunnel digging unexpectedly breaches them.

Sentence 7 of 17

The presence of the gas, in that sense, is not in itself surprising.

Sentence Breakdown

Part 1

The presence of the gas, in that sense,

The occurrence of methane in this geological environment,

Part 2

is not in itself surprising.

Is not shocking or unexpected on its own.

Sentence 8 of 17

Sentence Breakdown

Part 1

What remains unclear is far more consequential:

The things that are still unknown are much more important and significant:

Part 2

the precise circumstances in which the pocket was breached,

The exact details and conditions under which the trapped methane pocket was broken open,

Part 3

whether its risk was assessed and modelled during project planning,

Whether the danger of gas accumulation was calculated and simulated before construction began,

Part 4

and whether the gas-detection and ventilation safeguards

And whether atmospheric gas sensors and air circulation systems

Part 5

that such conditions demand were in place and functioning.

Which are required in such dangerous rock conditions were installed and working properly.

Sentence 9 of 17

Underground work in India’s difficult terrain has always been perilous.

Sentence Breakdown

Part 1

Underground work in India’s difficult terrain

Subterranean construction and excavation across India’s challenging geographical landscape

Part 2

has always been perilous.

Has consistently been extremely dangerous and risky.

Sentence 10 of 17

Sentence Breakdown

Part 1

In February this year,

In February 2026,

Part 2

an explosion at an illegal coal mine in Meghalaya killed about 30 workers,

A blast inside an unauthorized coal mine in Meghalaya state caused the deaths of nearly 30 laborers,

Part 3

and in 2023, a stretch of a road tunnel under construction in Uttarakhand collapsed,

And in November 2023, a section of a highway tunnel being dug in Uttarakhand caved in,

Part 4

trapping 41 workers for 17 days

Confining 41 construction workers deep underground for 17 straight days

Part 5

before they were pulled out.

Until rescue teams finally extracted them safely.

Sentence 11 of 17

The circumstances vary, but together they underscore how lethal underground and tunnelling work remains across the country.

Sentence Breakdown

Part 1

The circumstances vary,

The specific causes and conditions of each disaster differ,

Part 2

but together they underscore

But combined, these incidents emphasize and highlight

Part 3

how lethal underground and tunnelling work remains across the country.

How deadly subterranean excavation and tunnel building continue to be throughout India.

Sentence 12 of 17

Sentence Breakdown

Part 1

A series of hydropower projects along the 400-kilometre stretch of the Teesta

Multiple hydroelectric dams built along the 400 km length of the Teesta River

Part 2

that links Sikkim, West Bengal, and Bangladesh

Which flows through Sikkim and West Bengal before entering Bangladesh,

Part 3

have varied histories with environmental clearances

Have different past records of getting official government ecology approvals,

Part 4

but share a common feature — their location in the fragile Himalayan belt.

But all have one key factor in common: being situated in the eco-sensitive Himalayan region.

Sentence 13 of 17

Sentence Breakdown

Part 1

That vulnerability was demonstrated tragically in October 2023,

That environmental weakness was proven in a painful disaster in October 2023,

Part 2

when a glacial lake outburst flood from the South Lhonak lake

When a massive flash flood caused by a breaking glacier lake (South Lhonak Lake)

Part 3

destroyed the Teesta-III dam and killed more than a 100 people downstream.

Washed away the 1,200 MW Chungthang (Teesta-III) dam structure and caused over 100 deaths down the river course.

Sentence 14 of 17

Teesta-VI was absorbed by the public-sector NHPC Limited after its private developers, unable to afford escalating costs, went into insolvency.

Sentence Breakdown

Part 1

Teesta-VI was absorbed by the public-sector NHPC Limited

The Teesta Stage-VI project was taken over by government-owned enterprise NHPC Limited

Part 2

after its private developers, unable to afford escalating costs,

After its original private builders (Lanco Teesta), failing to manage rising expenses,

Part 3

went into insolvency.

Became bankrupt and unable to pay back debts.

Sentence 15 of 17

Relief and rescue must remain the immediate priority, and every effort to reach those still trapped is warranted.

Sentence Breakdown

Part 1

Relief and rescue must remain the immediate priority,

Saving lives and providing assistance must be the most urgent focus right now,

Part 2

and every effort to reach those still trapped

And all possible work to save workers currently confined inside the tunnel

Part 3

is warranted.

Is completely justified and necessary.

Sentence 16 of 17

But once the emergency has passed, the government cannot treat the disaster as an isolated misfortune.

Sentence Breakdown

Part 1

But once the emergency has passed,

However, after the immediate rescue crisis is over,

Part 2

the government cannot treat the disaster

State and central authorities must not handle this tragic incident

Part 3

as an isolated misfortune.

As an unavoidable, one-off bad luck event.

Sentence 17 of 17

It must order a thorough, independent review of whether the conditions attached to the project’s environmental clearance were, in practice, strictly met.

Sentence Breakdown

Part 1

It must order a thorough, independent review

The government must mandate an exhaustive and unbiased investigation

Part 2

of whether the conditions attached to the project’s environmental clearance

To check if the safety and ecological rules stipulated in the project’s green permit

Part 3

were, in practice,

Were actually on the ground and during daily operations,

Part 4

strictly met.

Fully and stringently satisfied or complied with.

Reading Comprehension

Practice questions based on this editorial

Reading Comprehension - Sikkim Tunnel Accident

Practice reading comprehension questions based on the editorial about the Teesta Stage-VI hydroelectric project tunnel accident in Sikkim.

7 Questions Passing: 70%

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Buried questions: on the Sikkim tunnel accident

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