The Crater With No Birth Certificate: Darvaza's Missing 1971

The last Landsat image of the Darvaza depression that shows no fire was taken on 20 September 1987. The first that shows one was taken on 27 February 1988. Every popular account of this place, including the Turkmen oil ministry's own English-language newsroom, says Soviet geologists lit the gas in 1971. No document has ever been produced for that date.

Silence Index — D-151

Quiet, but findable

Ranks 63 of 99 scored dossiers — quieter than 37% of the others we have scored. A low score is not a warning; it describes who else will be standing next to you.

How the total is weighted. These are the fixed weights of the four inputs, the same on every dossier — not this place’s scores. We do not publish per-input bars, because the per-input values were never recorded article by article and inventing four plausible numbers that sum to the total would be a fabrication dressed as a chart.

Footfall pressure — visitors measured against the ground that absorbs them30%

Access friction — permits, caps, seasons, boats, weather windows30%

Acoustic floor — how close the nearest engine is20%

Night darkness — how much sky is left20%

The index is a desk instrument scored by this publication, not a field measurement. How it is calculated, and where it fails.

What this dossier is built from

This is desk research. Nobody from this publication has been to Turkmenistan, and the country is one of the harder places on earth for an outsider to reach without a state-approved itinerary. What follows is assembled from a satellite remote-sensing preprint and the conference abstract that preceded it; the Turkmen state's own ministry and foreign-ministry releases, read in both their English and Turkmen-language sections, which turn out not to agree with each other; United States and United Kingdom government travel guidance; United States Geological Survey resource assessments of the Amu Darya basin; the UN Environment Programme's methane observatory and the International Energy Agency's methane tracker; UNESCO World Heritage and biosphere records; the World Bank's development indicators; the GeoNames gazetteer; and the published account of the only person known to have descended to the crater floor.

It is not a story about a hole in the ground. It is a story about a date that everyone repeats and nobody can source.

The date the satellites give

In June 2025 a team led by Adriana Valverde at the Universitat Politècnica de València, with co-authors at the UN Environment Programme's International Methane Emissions Observatory and the Environmental Defense Fund, posted a preprint that did something nobody appears to have done before: it went back through the Landsat archive and looked for the fire.

Landsat 1 to 3 carried the Multispectral Scanner from 1972. Landsat 4 and 5 carried the Thematic Mapper, with a thermal infrared band, from 1984. The team examined that thermal record across 1984 to 1988 and reported no sustained thermal anomaly consistent with active flaring. Then one appears. The last image without flaring is dated 20 September 1987; the first image showing flaring is dated 27 February 1988. Their conclusion is stated plainly: combustion began between late 1987 and early 1988.

That is a satellite-instrument result about burning, and it is worth being precise about its limits. It dates the fire. It does not date the hole. A pit can subside, vent gas and sit dark for years without a thermal sensor in orbit noticing anything at all, and the Multispectral Scanner that covered the 1970s had no thermal band to notice it with. The paper says so itself: the exact year of the crater's formation remains uncertain, and it describes an ongoing disagreement in the literature between 1963 and 1971.

So the finding is narrower than the headlines that followed it, and more damaging. It does not prove the crater was not created in 1971. It removes the only part of the 1971 story that an independent instrument could ever have confirmed — the flame — and puts it sixteen or seventeen years later than the story says.

What popular coverage gets wrong

The received version runs like this. In 1971 Soviet geologists drilling in the Karakum hit a gas cavern. The ground gave way and swallowed the rig. Fearing the escape of poisonous gas, the geologists set the leak alight, expecting it to burn out in a few weeks. It has burned ever since.

Every element of that paragraph circulates as fact. NASA's own Earth Observatory blog published it in September 2011, complete with the 1971 date and a crater "almost a hundred metres across". The BBC carried it in January 2022. The Moscow Times carried it the same week. National Geographic's education resource carries it, hedged as "according to legend". And the Turkmen State Concern Turkmengaz's ministry website carries it in English: "back in 1971, near the settlement of Darvaza in the Turkmen SSR, Soviet geologists discovered an accumulation of underground gas."

Here is what the primary record actually holds.

First, the state contradicts itself. On 24 June 2022 the same ministry website published, in its Turkmen-language news section, an account of the plan developed by the Natural Gas Research Institute of the State Concern Turkmengaz to bring the crater under control. That article dates the collapse to 1963, during exploratory well drilling, and describes the crater as having burned for almost sixty years. Five months earlier, in English, the same organisation had said 1971. Both pages are still up. Neither cites a document.

Second, the people who would hold the documents say they do not have them. In 2013 the Canadian explorer George Kourounis descended into the crater on a National Geographic expedition — the first person known to have done so. He came back with a different account from Turkmen geologists on the ground: that the collapse may have happened in the 1960s and that it went unlit until the 1980s. His summary of the evidentiary position was blunt. He did not know exactly what happened, he said, and there are no records; the department of geology "just didn't have anything that dated back that far."

Third, the 1980s ignition that Turkmen geologists described to Kourounis in 2013 is the version the Landsat thermal archive supports, twelve years later and by an entirely independent route. Two sources that could not have been coordinating — a working geologist's institutional memory and a stack of American satellite scenes — converge on the same decade. The 1971 date has neither.

What we can say, and all we can say, is this. The 1971 origin is universally repeated, including by the government that owns the gas field, and it is undocumented. It may still be right about the collapse. It is very unlikely to be right about the flame.

The hole, measured six ways

If a place has been photographed as often as this one, its dimensions ought to be settled. They are not, and the spread is a good measure of how little anybody has actually surveyed it.

• National Geographic, reporting the 2013 descent: 69 metres wide, 30 metres deep.
• National Geographic's education resource: about 76 metres wide, 30 metres deep.
• NASA's Earth Observatory blog, 2011: "almost a hundred metres across".
• Agence France-Presse reporting, January 2022: 70 metres wide, 20 metres deep.
• The Natural Gas Research Institute of Turkmengaz, 2022: 60 metres in diameter, about 20 metres deep, with a gas dispersal radius of 20 metres.
• Valverde and colleagues, 2025: approximately 30 metres deep and 60 to 70 metres in diameter.

The Royal Canadian Geographical Society, announcing Kourounis's Guinness World Records recognition, gives 69 metres as the crater's depth — the same figure National Geographic gives for its width. That is how a number drifts: a measurement is quoted, a unit or an axis is transposed, and the error is then quoted onward by everyone downstream. We have not resolved any of these. Nobody appears to have published a survey.

The expedition figures that are consistent across sources are the unpleasant ones. Ground temperature at the bottom around 400°C. Seventeen minutes on the floor to collect samples. A custom heat-reflective suit, breathing apparatus, a Kevlar harness rated not to melt, and fire-resistant rope. National Geographic dates the expedition to November 2013; the Royal Canadian Geographical Society dates it to October 2013. We have not been able to reconcile that either. The Guinness recognition was presented in May 2018, five years afterwards. The soil samples yielded bacteria that were not found in the surrounding desert outside the crater.

What is actually coming out of it

The Valverde team's second result is the one with policy weight. Using five hyperspectral imaging spectrometers — EnMAP, PRISMA, EMIT, GF-5A and ZY-1E — they detected 44 methane plumes between 2020 and 2025, with emission rates between 1,000 and 3,000 kilograms an hour. Over those five years they estimate a total of 71 ± 21 kilotonnes of methane. Extrapolating that annual rate back to the crater's formation gives something above 900 ± 300 kilotonnes.

Treat the second figure with more caution than the first. It is an extrapolation resting on a formation date the same paper says is unknown, and on the assumption that the venting rate has been roughly constant across five or six decades of reservoir depletion and, latterly, of deliberate drawdown. The five-year measured total is a measurement. The lifetime total is arithmetic performed on an unknown.

For scale: the annual figure works out at roughly fourteen kilotonnes. The International Energy Agency put global methane emissions from fossil fuel operations at 124 million tonnes in 2025. On our own arithmetic that makes Darvaza about one hundred-thousandth of the global fossil methane problem — a genuinely large point source, and a rounding error against the pipelines and wellheads of the country it sits in. We could not obtain a verified national figure for Turkmenistan's oil-and-gas methane, so we do not state the crater's share of it.

What Turkmenistan's national position is, the IEA does say. Its Global Methane Tracker for 2025 records Turkmenistan as having the second-highest upstream methane intensity in the world, and notes that emission events large enough for satellites to see are common there — around one third of all observations made by the UN's Methane Alert and Response System. The 2026 edition puts Turkmenistan and Venezuela together as having by far the highest methane intensities. Turkmenistan acceded to the Global Methane Pledge on 1 December 2023, at COP28 in Dubai, committing in principle to a 30% cut on 2020 levels by 2030.

The fire that has been ordered out three times

Closing the crater is a recurring item of Turkmen state business rather than a single event.

President Gurbanguly Berdimuhamedov called for the fire to be extinguished in 2010. Nothing verifiable followed. In 2018 he renamed it: officially it is no longer the Darvaza crater but the Shining of Karakum. On 7 January 2022 he ordered his deputy chairman for oil and gas to convene scientists and foreign consultants and find a way to put it out, citing damage to the environment, to the health of people living nearby, and the loss of gas that could otherwise be exported.

This time something did follow, and it was not firefighting. It was reservoir engineering. The Turkmengaz research institute's proposal was to drill into the Chaljulba structure of the Zeagli–Derweze field and pull gas out of the most productive strata — the gas-bearing formations lie between 200 and 950 metres — so that the pressure gradient feeding the crater falls away. In effect: starve it rather than smother it. The institute's 2022 note counts 39 production wells across eight developed fields in the surrounding zone, and sixteen gas fields discovered in the northern Central Karakum.

The state's account of the results, given at an investment forum in Paris in April 2024 and again at a conference in May 2025, is that satellite data showed combustion falling by more than half between September 2023 and February 2024 during forced gas extraction; that Well No. 11 came in during July 2024 producing low-pressure gas from 200 metres; that Well No. 4 followed in December 2024 at around 600,000 cubic metres a day; that a third well was completed in February 2025; and that the crater's combustion intensity has fallen more than threefold, on multi-sensor satellite data supplied by an outside analytics firm. Turkmengaz separately says national methane emissions fell 10% between 2020 and 2025 while production rose, attributing that finding to the independent analytics company Kayrros.

Independent reporting broadly corroborates the visible change. A British tour operator running trips to the site told RFE/RL at the end of 2025 that the flames were at a significantly lower level in 2024. A Turkmengaz researcher, Irina Luryeva, put it this way: where a massive glow was once visible for miles, today only faint combustion remains.

Two cautions belong next to that. The first is that we are relying on the state's own numbers for the wells, and the state does not publish the underlying data. The second is sharper, and it comes from the satellite paper rather than from us: Valverde and colleagues found the decline in flaring intensity but reported no apparent correlation between flaring intensity and methane release. A crater that burns less brightly is not automatically a crater that emits less methane — it may simply be venting more of it unburned, and unburned methane is a far more potent greenhouse gas than the carbon dioxide burning it would produce. The state's claim and the paper's finding are not the same claim, and we are not going to merge them.

The geology under all of it

The crater sits in the Amu Darya basin, which occupies central and eastern Turkmenistan and continues into Uzbekistan, Afghanistan and Iran. It is emphatically a gas basin rather than an oil one, with gas fields present through all its main structural zones and multiple structural and stratigraphic traps.

The scale of it keeps being revised upward. The US Geological Survey's 2011 assessment gave mean undiscovered conventional resources of 52 trillion cubic feet of gas, 962 million barrels of oil and 582 million barrels of natural gas liquids for the Amu Darya province. A separate 2017 assessment added 35.1 trillion cubic feet of undiscovered continuous — that is, tight and unconventional — gas. The 2026 assessment, covering the Amu Darya and Afghan-Tajik provinces together, gives mean undiscovered conventional resources of 218 trillion cubic feet of gas and 442 million barrels of oil. The provinces covered are not identical, so the figures are not directly comparable, and we present them as three separate assessments rather than a trend.

The surface is the Karakum, the sand desert that covers most of Turkmenistan. Its ecology is not nothing: at Repetek, in the eastern Karakum, a reserve established in 1927 and made a UNESCO biosphere reserve in 1978 protects 34,600 hectares of core habitat within a 251,318-hectare network, holding one of Central Asia's few large stands of black saxaul, goitered gazelle, and twenty-two reptile species.

Getting there, honestly

The United States currently rates Turkmenistan Level 1, exercise normal precautions, updated on 21 August 2026. That is the lowest of the four levels and it is not the constraint. The constraint is the entry regime.

A visa requires a letter of invitation. For tourism, that comes from an authorised Turkmen travel agency; the UK Foreign, Commonwealth and Development Office notes that applications made to embassies are referred to Ashgabat for a decision, which can take up to a month. A transit visa exists for stays under five days but requires its own advance invitation and cannot be converted to a tourist visa. On arrival there is a registration fee and a COVID-19 test fee. Anyone staying more than three working days must register with the State Migration Service within three days of arrival and register their departure the day before leaving; the US State Department warns that failure can mean fines, arrest or deportation, and a re-entry ban of up to five years. Foreigners may not enter designated restricted zones — border areas and the Caspian coast — without specific permission.

Beyond that, the FCDO's practical notes: land border crossings are subject to occasional and unannounced closures, the Afghan and Iranian border areas are tightly restricted, photographing airports, military sites, police stations, government buildings and embassies is illegal, driving standards are poor, and road travel at night outside cities is particularly dangerous because of the state of the roads. The last of those matters here, because the crater is best seen at night and lies about 270 kilometres north of Ashgabat, by Turkmengaz's own reckoning, on the highway toward Daşoguz.

How many people make that trip, nobody outside the government knows. The World Bank's series for international tourist arrivals in Turkmenistan carries four values — 233,000 in 1995 rising to 380,000 in 1998 — and then nothing. Every year from 1999 to 2025 is null. A country that has published no arrivals figure in twenty-seven years is not a country whose footfall you can estimate.

Why the Silence Index is 68

Access friction is close to the top of our scale and is doing almost all the work: an invitation letter, an agency, a decision taken in Ashgabat, a migration registration on both ends and a re-entry ban for getting it wrong. Footfall pressure is genuinely low in absolute terms — but Darvaza is the single most visited thing in Turkmenistan outside the cities, tour operators run overnight camps on the rim, and there is no cap, no permit and no ranger. The acoustic floor is compromised by the site itself: 4x4s, generators, camp, and until recently the roar of the crater. Night darkness is the input that sinks the score, because for nearly forty years this place produced its own light pollution on an industrial scale, and even a dying fire is not darkness. What it is not is an untouched wilderness. A drive-up attraction with a hard visa in front of it scores in the high sixties, not the nineties.

What happens next

On the state's account, the crater is being closed by attrition and is nearly out. On the independent satellite account, the flaring is measurably down and the methane is not measurably tracking it. Both can be true at once, and the honest reading is that Turkmenistan has become better at extracting the gas that used to feed the fire without anyone yet demonstrating that less methane reaches the atmosphere.

There is one more thing the archive cannot give back. Whatever the answer is — 1963, 1971, a collapse in one decade and a match in another — the people who knew it are dead and the department that should have filed it says it never had the paperwork. A satellite can tell you when something started burning. It cannot tell you who struck the light, or why, or whether anybody wrote it down. In 2026 the fire is going out, and the only certain thing about the most photographed hole in Central Asia is that its own government has published two different birthdays for it and produced evidence for neither.

The Traveler's Panel · checked 20 August 2026

Changing information. Prices, permits, seasons and road access change, sometimes at short notice. Everything here is a starting point for your own confirmation — not a quote, and not a guarantee. Verify with the operator and the relevant official body before you book.

The famous date	1971 is universally repeated and has no documentary basis we could find
What the satellites say	Combustion began between 20 Sept 1987 and 27 Feb 1988 (Landsat)
The state's own record	1971 in English, 1963 in Turkmen — both on the oil ministry's site
Current condition	Turkmengaz says only faint combustion remains; flaring measurably down
Entry	Visa by letter of invitation via an authorised Turkmen agency; decision in Ashgabat
Registration	State Migration Service within 3 days; register departure the day before
Advisory	US Level 1, updated 21 August 2026. The difficulty is administrative, not danger

Getting there — Ashgabat → Bokurdak → Ýerbent → Darvaza (about 270 km north by highway)

1. Darvaza sits about 270 kilometres north of Ashgabat, on the highway toward Daşoguz, by the reckoning of Turkmengaz's own research institute. The tarmac runs past it; the crater is a short distance off the road across sand, which is where the 4x4 becomes necessary rather than optional.
2. You cannot arrange this independently in the way you would arrange a desert trip elsewhere. A tourist visa requires a letter of invitation issued by an authorised Turkmen travel agency, and the FCDO notes that embassy applications are referred to Ashgabat for a decision that can take up to a month. Build the timeline around that, not around flights.
3. A transit visa exists for stays under five days and is sometimes used by overland travellers, but it requires its own advance letter of invitation and cannot be converted into a tourist visa once you are in the country.
4. Register with the State Migration Service within three working days of arrival if you are staying longer than three working days, and register your departure the day before you leave. The US State Department warns that failing to do so can mean fines, arrest or deportation, and a re-entry ban of up to five years.
5. Do not improvise a night drive. The FCDO's assessment is that road travel at night outside cities is particularly dangerous because of the condition of the roads — which is awkward, because the crater is a night subject, and the standard answer is to camp rather than to drive back.
6. Restricted zones — border areas and the Caspian coast — require specific permission from the State Migration Service. Darvaza is not one of them, but a wider Karakum itinerary may touch one.

Indicative costs — verify before booking

The crater itself	No published entrance fee, no ticket office, no permit, no ranger
The real cost	The visa and the agency. A letter of invitation must come from a licensed Turkmen operator, and prices are quoted per itinerary, not per site
On arrival	A registration fee and a COVID-19 test fee are charged at the airport; the State Department lists them at USD 29 and USD 31
What we will not quote	Tour prices. Every figure we found came from operators selling the tour, and none from a state tariff or a published schedule
Timing cost	Allow a month for the visa decision to come back from Ashgabat

What to pack

• Everything for a night in open desert with no facilities: there is no water, no shelter and no shade at the rim, and the Karakum swings hard between day and night temperatures.
• A camera that handles high dynamic range in the dark. The subject is a dim fire in a black pit, and it is dimmer every year — the pictures that made this place famous were taken of a fire that no longer exists at that intensity.
• Printed copies of your visa, letter of invitation and migration registration. Turkmenistan is a paperwork state and the paperwork is checked.
• Nothing you would mind not photographing. Airports, military sites, police stations, government buildings and embassies are all off-limits to cameras by law.
• Realistic expectations about the rim itself. There is no barrier, no railing and no rescue.

Where to stay

There is no accommodation at Darvaza and no settlement at the crater. Derweze village, the gazetteer entry the crater borrows its name from, lies roughly 8.5 kilometres south and is not a tourist base. In practice everyone who stays does so in a tented or yurt camp set up on the sand near the rim by the operator who brought them, which is the arrangement that makes the site's Silence Index lower than its remoteness suggests: on a given night in season you may well be sharing an empty desert with the only other people in it. The alternative is a long day trip from Ashgabat, which means driving one leg of a 540-kilometre round trip in the dark on roads the FCDO specifically warns about. Ashgabat itself has the country's only substantial hotel stock; Daşoguz, about 250 kilometres north, is the other end of the same highway and the practical base for Köneürgenç.

Safety & responsible travel

• Do not repeat the 1971 date as fact, and be careful with the lost-drilling-rig detail. No Turkmen state page and no peer-reviewed source we opened mentions a rig at all — they describe a drilling-induced collapse and nothing more. National Geographic's own education resource presents the swallowed-rig version explicitly as legend.
• Stay back from the edge and off the slope. One person is known to have descended, in 2013, in a heat-reflective suit with breathing apparatus and fire-resistant rope, and had seventeen minutes on a floor at around 400°C.
• Use a licensed Turkmen operator, because the visa system leaves no alternative, and expect a guide. That is the access regime, not an upsell.
• Be careful with the emissions story in both directions. The fire is visibly smaller and the state says emissions are down threefold; the satellite paper found no correlation between flaring intensity and methane release. A smaller flame is not automatically less methane.
• Leave the camp site as sand. There is no waste collection anywhere near this place.

Nearby, and quieter

Two smaller craters of the same family lie within a few kilometres of the burning one — a water-filled depression and a mud-filled one — neither of which has a gazetteer entry or any published survey, which is why they are not pinned on this map. North along the highway is Köneürgenç, inscribed by UNESCO in 2005, the former Khorezmian capital with its 11th- to 16th-century mausoleums and a 60-metre minaret in 353 hectares of protected ground. Far to the east, on the other side of the Karakum, the Repetek reserve has protected black saxaul desert since 1927 and has been a UNESCO biosphere reserve since 1978 — 34,600 hectares of core within a 251,318-hectare network. And Ashgabat, which most visitors treat as a transit point, is the one city on earth built almost entirely in white marble by state decree.

Getting there, in order

• 1Ashgabat
• ↓
• 2Bokurdak
• ↓
• 3Ýerbent
• ↓
• 4Darvaza (about 270 km north by highway)

Each leg is a separate booking and a separate chance to be weathered out. Build spare days into the chain, not onto the end of it.

Where it is

Darvaza gas crater, Karakum Desert, Turkmenistan · 40.2526°N 58.4394°E · Open in Google Maps · OpenStreetMap

Key locations

• Darvaza gas crater — approximate; no gazetteer or official source publishes a coordinate for it
  40.2526°N 58.4394°E
• Derweze — the village the crater is named after, about 8.5 km south
  40.1754°N 58.4085°E
• Ýerbent — desert settlement roughly halfway up the Ashgabat road
  39.3136°N 58.5975°E
• Bokurdak — last sizeable settlement on the highway before the deep desert
  38.7631°N 58.4927°E
• Ashgabat — the only realistic arrival point and where every visa decision is taken
  37.9600°N 58.3800°E
• Daşoguz — northern end of the same highway, about 250 km beyond the crater
  41.8363°N 59.9666°E
• Köneürgenç — the UNESCO-inscribed Khorezmian capital, north-west of Daşoguz
  42.3277°N 59.1544°E

Coordinates are for orientation and are accurate to roughly the width of the feature named, not to a doorway. Several of these points are inside protected areas or need a permit, a guide or a boat — read the access notes above before you plan a route to any of them.

Sources & further reading — checked 20 August 2026

1. EarthArXiv — Valverde, Irakulis-Loitxate, Gorroño, Pei and Guanter, 'Satellite-based assessment of methane emissions from the Darvaza gas crater' (preprint, 20 June 2025). The abstract: substantial uncertainty over whether the crater formed in 1963 or 1971; combustion beginning between late 1987 and early 1988 from historical Landsat imagery; 44 methane plumes detected 2020–2025 by EnMAP, PRISMA, EMIT, GF-5A and ZY-1E at 1,000–3,000 kg/h; 71 ± 21 kt over five years; above 900 ± 300 kt extrapolated since formation; and a gradual decline in flaring with no apparent correlation to methane release
2. EarthArXiv — full preprint PDF, Valverde et al. (2025). The dating evidence in detail: Landsat 4–5 Thematic Mapper thermal data across 1984–1988 showing no sustained flaring anomaly, the last image without flaring on 20 September 1987 and the first with flaring on 27 February 1988; crater dimensions of approximately 30 m deep and 60–70 m in diameter; the Chaljulba structure of the Zeagli–Derweze field and gas-bearing formations at 200–950 m; and the statement that the exact year of formation remains uncertain
3. Copernicus / EGU General Assembly 2025 — Valverde, Irakulis-Loitxate, Gorroño and Guanter, 'Analysis of Methane Emissions from the Darvaza Gas Crater' (abstract EGU25-11171). The authors' affiliations at the Universitat Politècnica de València, UNEP's International Methane Emissions Observatory and the Environmental Defense Fund; and the same team stating the 1971 origin as settled in a conference abstract while their preprint calls it uncertain
4. National Geographic — 'Entering the Door to Hell' / Kourounis expedition report. The November 2013 descent; crater dimensions of 225 feet (69 m) wide and 99 feet (30 m) deep; Kourounis's account that Turkmen geologists said the collapse may have happened in the 1960s and gone unlit until the 1980s, that there are no records, and that the department of geology had nothing dating back that far; and the bacteria found in crater-floor soil but not outside it
5. National Geographic Education — 'Entering the Door to Hell'. The 1971 story presented explicitly as legend; crater dimensions given as about 76 m wide and 30 m deep; the two years spent obtaining permission to enter Turkmenistan; and the extremophile sampling objective
6. Royal Canadian Geographical Society / Canadian Geographic — 'RCGS Explorer-in-Residence recognized by Guinness World Records'. The Guinness World Records citation presented in May 2018 for the first descent; the expedition dated to October 2013 rather than November; ground temperature around 400°C; seventeen minutes on the crater floor; and the 69-metre figure given as depth rather than width
7. Ministry of Oil and Gas Industry of Turkmenistan — 'Gurbanguly Berdimuhamedov instructed to find a way to extinguish the gas crater in Darvaza' (11 January 2022). The Turkmen state's English-language statement that Soviet geologists found the gas in 1971; the instruction of Friday 7 January 2022 to Vice-Chairman Shakhym Abdrakhmanov to engage scientists and foreign consultants; and the three stated reasons — environment, the health of people living nearby, and lost export revenue
8. Ministry of Oil and Gas Industry of Turkmenistan — Turkmen-language news, 'Scientists of Turkmenistan have developed a way to take control of the Darvaza crater' (24 June 2022). The same ministry dating the collapse to 1963 during exploratory drilling and describing almost sixty years of burning; the Natural Gas Research Institute's plan to drill an appraisal well at the Chaldzhulba field; crater diameter 60 m and depth about 20 m; 270 km from Ashgabat; 39 production wells across eight developed fields; and sixteen gas fields discovered in the northern Central Karakum
9. Ministry of Oil and Gas Industry of Turkmenistan — 'Reducing methane emissions and taming the Darvaza crater will be discussed at the investment forum in Paris' (TEIF 2024, 24–25 April 2024). The proposal to drill a well opening all productive strata to reduce gas flow into the crater, and the state's claim that satellite data from September 2023 to February 2024 showed combustion reduced by more than 50% during forced gas extraction
10. Ministry of Oil and Gas Industry of Turkmenistan — 'Turkmengas: Turkmenistan successfully reduces methane emissions'. The claim, attributed to the analytics company Kayrros, that total Turkmen methane emissions fell 10% from 2020 despite rising production; that crater combustion intensity has more than halved; Well No. 11 developed in July 2024 producing low-pressure gas from 200 m; Well No. 4 completed in December 2024 at about 600,000 m³ a day; and MARS implementation in March 2024
11. Ministry of Oil and Gas Industry of Turkmenistan — 'Draft roadmap for reducing methane emissions has been prepared' (1 October 2024). The 2025–2026 roadmap and comprehensive plan following COP28, the stated goal of reducing methane emissions by 2030 through energy-sector modernisation, and the named partners — the UNFCCC secretariat, the World Bank, the Asian Development Bank and the Islamic Development Bank
12. Government of Turkmenistan — 'Turkmenistan's achievements in reducing methane emissions announced at TESC 2025' (5 June 2025). The state's claim that Darvaza's combustion intensity fell more than threefold between 2013 and 2025 on multi-sensor satellite data supplied by Capterio; two high-flow wells operating as of February 2025 with a third completed that month; and the 30%-by-2030 target against 2020 levels
13. Ministry of Foreign Affairs of Turkmenistan — 'Turkmenistan joined the Global Methane Pledge'. President Serdar Berdimuhamedov announcing accession to the Global Methane Pledge on 1 December 2023 at COP28 in Dubai, after signalling interest at COP26 in Glasgow and adopting an updated Nationally Determined Contribution in May 2022
14. The Times of Central Asia — 'Turkmenistan contains Gate to Hell fire after decades of inferno'. Turkmengaz researcher Irina Luryeva's statement that where a massive glow was once visible for miles only faint combustion now remains, the threefold reduction in methane emissions claimed on independent satellite data, and the programme of additional wells drilled around the crater
15. The Times of Central Asia — 'Turkmen scientists develop plan to extinguish the Darvaza gas crater' (31 December 2025, updated 7 January 2026). The Natural Gas Research Institute's plan to divert gas by intensive extraction from the most productive reservoir; crater diameter about 60 m and depth 20 m; gas-bearing layers between 200 and 950 m; and roughly 270 km north of Ashgabat
16. RFE/RL — 'Closing the Gates of Hell: Turkmenistan's fiery gas crater is being snuffed out' (31 December 2025). Tour operator Dylan Harris of Lupine Travel reporting significantly lower flames in 2024; Irina Luryeva on reopened mothballed wells cutting the fires nearly threefold; the 2010 order by Berdimuhamedov; and the account that the crater formed in the 1960s or 1970s
17. BBC News — 'Turkmenistan plans to close its Gateway to Hell'. The January 2022 order; the 2010 order that preceded it; the 2018 official renaming to 'Shining of Karakum'; and the explicit statement of the conflict between local geologists' 1960s-collapse account and the popular 1971 story, with Kourounis's finding that no one actually knows how it started
18. The Moscow Times — 'Turkmenistan plans to close giant burning gas pit' (9 January 2022). The AFP-sourced dimensions of 70 metres wide and 20 metres deep, the 1971 origin as reported, the 2010 order, and the 2018 renaming
19. International Energy Agency — Global Methane Tracker 2025, Regional insights. Turkmenistan having the second-highest upstream oil and gas methane intensity in the world, and emission events large enough for satellite detection representing around one third of all observations from the Methane Alert and Response System
20. International Energy Agency — Global Methane Tracker 2026, Key findings. Global methane emissions from fossil fuel operations of 124 Mt in 2025 — the denominator used in this dossier's scale comparison — no sign of decline, and Turkmenistan and Venezuela having by far the highest methane intensities
21. UN Environment Programme — Methane Alert and Response System (MARS). That MARS was announced at COP27 in November 2022, began pilot operations in January 2023 and became fully operational in January 2024, drawing on more than 30 satellite instruments
22. UN Environment Programme — 'Satellite alerts spur methane cuts but room for progress remains' (23 July 2025). The rise in MARS notification response rates from 1% to 10%, and the Turkmenistan case in which an unlit flare vented methane for 48 hours before Turkmengaz issued ignition warnings to flare operators
23. UN Environment Programme — International Methane Emissions Observatory. IMEO's four data streams — methane science studies, MARS, OGMP 2.0 and national inventories — and the Global Methane Pledge's 150 countries and 30%-by-2030 target against a 2020 baseline
24. NASA Earth Observatory — 'Gates of Hell' (Earth Matters blog, 14 September 2011). A NASA science outlet publishing the undocumented 1971 origin as fact, and giving the crater as almost a hundred metres across — the widest dimension in circulation and the clearest example of the story's institutional reach
25. UK Foreign, Commonwealth and Development Office — Turkmenistan travel advice, entry requirements. The letter-of-invitation requirement, issued for tourism by authorised travel agencies; visa applications referred to Ashgabat for a decision taking up to a month; transit visas for stays under five days that cannot be converted; and State Migration Service registration within three days for stays over three working days
26. UK Foreign, Commonwealth and Development Office — Turkmenistan travel advice, safety and security. Occasional unannounced land border closures; tightly restricted access near the Afghan and Iranian borders; the illegality of photographing airports, military infrastructure, police stations, government buildings and embassies; and the warning that road travel at night outside cities is particularly dangerous
27. US Department of State — Turkmenistan International Travel Information. The letter-of-invitation process through the State Migration Service; registration within three working days and departure registration the day before leaving; penalties of fines, arrest or deportation and re-entry bans of up to five years; the prohibition on entering restricted zones without SMS permission; and the arrival fees
28. US Department of State — Turkmenistan Travel Advisory. Level 1, Exercise Normal Precautions, updated 21 August 2026, with limited medical services and seismic activity as the noted risks — establishing that the difficulty of visiting is administrative rather than a matter of danger
29. US Geological Survey — Fact Sheet 2011-3154, Klett and others, 'Assessment of undiscovered oil and gas resources of the Amu Darya Basin and Afghan-Tajik Basin Provinces'. Mean undiscovered conventional resources for the Amu Darya Basin Province of 52 trillion cubic feet of gas, 962 million barrels of oil and 582 million barrels of natural gas liquids
30. US Geological Survey — Fact Sheet 2017-3058, Schenk and others, 'Assessment of undiscovered continuous gas resources in the Amu Darya Basin Province'. Mean undiscovered technically recoverable continuous gas resources of 35.1 trillion cubic feet across Turkmenistan, Uzbekistan, Iran and Afghanistan
31. US Geological Survey — Schenk and others, 'Assessment of undiscovered conventional oil and gas resources in the Amu Darya Basin and Afghan-Tajik Basin Provinces, 2026'. The 2026 assessment giving mean undiscovered conventional resources of 218 trillion cubic feet of gas and 442 million barrels of oil across the two provinces combined
32. World Bank — International tourism, number of arrivals, Turkmenistan (indicator ST.INT.ARVL). That the series carries values only for 1995–1998, rising from 233,000 to 380,000, and is null for every year from 1999 to 2025 — the basis for this dossier's refusal to estimate footfall
33. UNESCO World Heritage Centre — Kunya-Urgench. Inscription in 2005 under criteria (ii) and (iii); 353.24 ha with an 883.3 ha buffer zone on the left bank of the Amu Darya in northwestern Turkmenistan; and 11th–16th century monuments including a 60 m minaret
34. UNESCO — Repetek Biosphere Reserve, Turkmenistan. A reserve established in 1927 in the eastern Karakum and designated a biosphere reserve in 1978, covering 251,318 ha with a 34,600 ha core, protecting black saxaul stands, goitered gazelle and 22 reptile species
35. GeoNames gazetteer — Derweze, Ahal, Turkmenistan. The only gazetteer entry for the name: Derweze (also Darvaza), populated place, 40.17536°N 58.408489°E in Ahal Region — and the absence of any gazetteer record for the crater itself
36. GeoNames gazetteer — Ýerbent, Ahal, Turkmenistan. Ýerbent at 39.31355°N, 58.59751°E — the desert settlement roughly halfway along the Ashgabat road, used here as a verified waypoint
37. GeoNames gazetteer — Bokurdak, Ahal, Turkmenistan. Bokurdak at 38.76307°N, 58.49269°E, population about 7,726 — the last sizeable settlement on the highway before the deep desert
38. GeoNames gazetteer — Daşoguz and Köneürgenç. Daşoguz, seat of the first-order administrative division, at 41.83625°N 59.966615°E with a population of 201,142 — the northern end of the highway the crater sits beside

Official and scientific bodies are the authority for safety, regulatory and scientific claims. Commercial operators are used only for practical detail such as tour length, meeting points and indicative pricing — never for a safety or scientific statement.