129 Fun Facts About Chernobyl

In 2019 scientists turned grain grown in Chernobyl's exclusion zone into which drink, branded Atomik?

Vodka: distilling left the radioactivity behind in the waste, so the spirit came out no more radioactive than any other, and its makers meant the profits to help communities around the zone.

In 2011 Ukraine officially opened the Chernobyl exclusion zone to which group?

Tourists: Ukraine declared the zone an official attraction in 2011 and visits peaked in 2019, but the Russian invasion of 2022 closed it to visitors again.

Besides Chernobyl, which accident is the only other rated Level 7, the top of the International Nuclear Event Scale?

Fukushima: Japan first gave its 2011 accident a lower rating, then raised it to the maximum a month later, once the size of the early releases became clear.

The Chernobyl explosion came during a safety test that simulated what kind of emergency?

A station blackout: engineers wanted to know whether the turbine, still spinning as it coasted down, could keep the coolant pumps running until the diesel generators took over.

Unlike most Western reactors, Chernobyl's reactor lacked which safety feature?

A containment building: the core sat in a concrete-lined cavity under a 1,000-tonne lid instead of inside a sealed dome, so when the lid blew off its contents went straight into the open air.

In Chernobyl's RBMK reactor, what did steam bubbles forming in the cooling water do?

Steam bubbles increased core reactivity: in an RBMK the water absorbed more neutrons than it moderated, so boiling removed an absorber and power rose, the flaw known as a positive void coefficient.

Which fission by-product 'poisoned' Chernobyl's reactor, keeping power far below the level the test plan required?

Xenon-135, a strong neutron absorber, accumulates when power falls; after the reactor slumped to about 30 MW thermal, it held output far below the 700 MW the test plan required.

What was the name of the emergency shutdown button pressed seconds before Chernobyl's reactor exploded?

AZ-5 was the RBMK's emergency protection button; pressing it drove every control rod into the core at once, and within seconds power surged instead of falling.

What was on the tip of each RBMK control rod, displacing water and briefly boosting power?

Each rod ended in a graphite extension, or displacer; as a rod went in, the graphite pushed water out of the channel's lower end first, briefly adding reactivity before the absorber arrived.

Chernobyl's first explosion was steam; which gas is thought to have fuelled the second, seconds later?

Hydrogen: steam reacting with the red-hot zirconium cladding of the fuel is thought to have released it, though experts still dispute what the second blast was.

How soon in Russia's 2022 invasion of Ukraine was the Chernobyl plant seized?

On the first day: troops crossing from Belarus on 24 February 2022 took the whole site by evening, and the staff on shift were kept working without a shift change.

Radiation from Chernobyl was first detected outside the USSR at a nuclear plant in which country?

Sweden raised the alarm: on the morning of 28 April workers at a Swedish nuclear plant more than 1,000 km away set off contamination alarms, and by evening Moscow had admitted an accident.

How did Moscow first announce the Chernobyl accident?

A TV bulletin: the evening programme Vremya read a few terse sentences saying one reactor was damaged, and the country's leader did not speak publicly about it for another 16 days.

What was dropped from helicopters onto the burning reactor in the days after the explosion?

Helicopter crews dropped some 5,000 tonnes of sand, lead, clay and boron onto the ruin in the ten days after the blast; later analysis suggested very little of it reached the core.

Three engineers waded through flooded corridors to open valves and drain what beneath Chernobyl's reactor?

The three engineers drained the bubbler pools, the pressure-suppression pools beneath the reactor; officials feared molten corium reaching that water would trigger a steam explosion, but it dripped in harmlessly.

Coal miners dug a tunnel under Chernobyl's ruined reactor to make room for what?

The miners dug the chamber for a cooling system meant to stop the melt reaching the groundwater; it was later judged unnecessary and the space was filled with concrete.

What name was given to the clean-up workers sent to deal with the Chernobyl disaster?

Liquidators were the soldiers, reservists, miners and pilots sent to contain the disaster; many worked with inadequate protective gear and took high doses of radiation.

A 2023 genetic study examined which animals at the Chernobyl plant, thought to descend from pets abandoned in 1986?

Dogs: squads were sent to shoot the pets left behind in the evacuation, but some escaped and clean-up workers fed them; the hundreds around the plant are thought to be their descendants.

What happened to the Chernobyl commission's leading scientist the day after the disaster's second anniversary?

He took his own life: Valery Legasov left taped memoirs on the accident and the reactor's flaws, and extracts were published within weeks of his death.

Firefighters at Chernobyl described the intense radiation as tasting like what?

Metal: firefighters spoke of a metallic taste and pins and needles on the face, and people in nearby Pripyat noticed the same taste before anyone had told them of the accident.

Roughly how many people lived in Pripyat when the city was evacuated after the Chernobyl explosion?

About 49,000 people lived in Pripyat, the plant workers' city; more than a thousand buses emptied it in a few hours on 27 April 1986.

Pripyat's famous abandoned Ferris wheel had been due to open officially for which holiday?

May Day: the amusement park was due to open on 1 May 1986, days after the explosion; the city was evacuated first, and the idle wheel became a symbol of the disaster.

Which purpose-built city replaced Pripyat as home for the plant's workers?

Slavutych was started within months of the accident to rehouse the plant's staff; builders from several Soviet republics each designed a district, named at first after their own capitals.

The pine woodland near the Chernobyl plant whose trees died after absorbing high levels of radiation became known as what?

The Red Forest takes its name from the ginger-brown colour its pines turned as they died after soaking up the heaviest fallout.

What is Chernobyl's 'Elephant's Foot'?

The Elephant's Foot is a mass of solidified corium under the reactor: molten fuel that mixed with concrete and sand, flowed down and set in wrinkled folds like an elephant's skin.

Which rock star wrote the 1987 song 'Time Will Crawl' after hearing news of the Chernobyl disaster?

David Bowie was in Switzerland, taking a break from recording, when he heard of the accident; the song that came of it is about the planet's destruction by pollution and industry.

Which two isotopes from Chernobyl were most responsible for radiation doses to the general population?

Iodine-131 and caesium-137: the short-lived iodine drove the surge in childhood thyroid cancers, while the caesium, with a half-life of 30 years, is the reason the land stays contaminated.

Chernobyl fallout led to 26 years of movement restrictions on which British farm animals?

Sheep: fallout settled on upland pastures in Wales, Cumbria and Scotland, so animals had to be tested before sale until the last farms were released in 2012.

By 2005, roughly how many thyroid cancers had been found in people exposed to Chernobyl fallout as children?

More than 6,000 thyroid cancers had been diagnosed by 2005 among people who were children or adolescents in 1986, yet the disease proved so treatable that only fifteen of them had died.

How many plant workers and firefighters died of acute radiation sickness within months of the Chernobyl accident?

28: of 134 workers and firefighters with confirmed acute radiation syndrome, 28 died within about three months; the far larger tolls quoted for Chernobyl are projections of later cancers.

How was the giant New Safe Confinement arch moved into place over Chernobyl's ruined reactor?

Slid along rails: to spare workers the radiation, the 36,000-tonne arch was built at a distance and pushed 327 metres into place over two weeks, the largest movable land-based structure ever built.

The New Safe Confinement's cranes were built for what work on Chernobyl's 1986 shelter?

Dismantling: the original was built in haste, so the arch was designed to let machines take its unstable parts apart and reach the fuel inside, a clean-up expected to run until at least 2065.

What kind of small power station has since been built a few hundred feet from Chernobyl's ruined reactor?

A solar farm: its panels sit on contaminated land that cannot be farmed or logged, and the old plant's power lines were already there to carry the electricity away.

Which endangered wild equine was released to roam free in the Chernobyl exclusion zone?

Przewalski's horse: thirty-one were released into the zone, and despite losses to poachers the herd had grown to more than a hundred by 2019.

Which Call of Duty game sends players sneaking through Pripyat in 'All Ghillied Up'?

Call of Duty 4: Modern Warfare set two 2007 missions in the abandoned city, ending beside its Ferris wheel, and is credited with sending a wave of curious gamers to see the real place.

What did Russian troops do in Chernobyl's most contaminated woodland during their 2022 occupation?

Dug trenches: soldiers dug in and drove heavy vehicles across the zone's most contaminated ground, stirring up radioactive dust, before pulling out on 31 March 2022 after about a month.

The Chernobyl plant originally carried the name of which Soviet leader?

Lenin: the station was formally the V. I. Lenin Nuclear Power Station, honouring the Soviet Union's founder; Ukraine's later decommunisation laws swept his name and statues from towns across the country.

Who created and wrote the 2019 HBO/Sky miniseries Chernobyl?

Craig Mazin, until then best known for comedies such as The Hangover Part II, created and wrote every episode; he won the 2019 Emmy for writing a limited series.

In HBO's Chernobyl, Emily Watson's character Ulana Khomyuk is what?

A fictional composite of many scientists: the closing titles say Khomyuk was invented to stand for the many researchers who worked to understand the accident.

HBO's Chernobyl shot its reactor scenes at the decommissioned Ignalina plant in which country?

Ignalina, in Lithuania, had two RBMK reactors, the only ones built outside Russia and Ukraine; its last unit was shut down in 2009 as a condition of EU membership.

Which Russian nuclear plant, home of the very first RBMK reactor, kept a Soviet-era city name?

Leningrad: the station on the Gulf of Finland started the first RBMK in 1973 and kept its name when nearby Leningrad became St Petersburg again; Chernobyl was the third plant of the type.

In which direction from Ukraine's capital, Kyiv, does the Chernobyl plant lie?

North: the plant stands close to the border with Belarus, which is why the first winds carried much of the fallout out of Ukraine altogether.

When the Chernobyl accident happened, what was under construction at the plant?

Two more reactors: units 5 and 6 were going up beside the four working ones; the accident put an end to the work and neither was ever finished.

The Pripyat River, which fed the Chernobyl plant's cooling pond, flows into which major river?

The Dnieper: the Pripyat joins it at the Kyiv Reservoir, so contamination washed off the zone could travel towards the capital and on down Ukraine's main river.

Which Soviet pressurised-water reactor design is contrasted with the RBMK as safer?

The VVER, a pressurised-water design with a steel pressure vessel, became the Soviet export model; Ukraine finished two more of them in 2004 to replace the output lost when Chernobyl closed.

What does the RBMK acronym translate to in English?

RBMK stands for Reaktor Bolshoy Moshchnosti Kanalnyy, 'high-power channel-type reactor': each fuel assembly sat in its own pressure channel, so operators could swap fuel while the reactor kept running.

Which country gave millions of its children a thyroid-protecting drink within days of Chernobyl?

Poland: within three days its clinics gave millions of children and adults a protective solution that saturates the thyroid, so the gland could not take up the fallout.

Roughly how far from the Chernobyl plant was the workers' city of Pripyat?

3 km: Pripyat was built in 1970 to house the plant's staff, yet for some 36 hours after the explosion its people were told nothing and life went on as normal.

Which Russian oblast, wedged between Belarus and Ukraine, received Russia's heaviest Chernobyl fallout?

Bryansk Oblast took Russia's heaviest fallout because rain fell as the plume drifted over in the last days of April, washing it out of the sky onto the oblast's south-western districts.

Which European country voted in a 1987 referendum to turn away from nuclear power after Chernobyl?

Italy: voters backed three anti-nuclear measures in November 1987, the country shut its last reactors within three years, and the nuclear electricity it uses today is all imported.

To what radius around the plant was Chernobyl's exclusion zone widened in May 1986?

The 30 km radius, set in early May 1986 after the first 10 km zone proved inadequate, gave the area its lasting name, the 30-Kilometre Zone; it was evacuated and placed under military control.

Roughly how large is the Ukrainian part of the Chernobyl exclusion zone?

The Ukrainian zone covers about 2,600 square kilometres, and officials say its worst-hit ground will stay unfit to live on for thousands of years.

What did Chernobyl's samosely villagers do after the evacuation?

Moved back home: about a thousand evacuees slipped back within months, and officials came to tolerate these mostly elderly 'self-settlers', down to a hundred or two by 2017.

What was Ukraine promised in 1995 for closing Chernobyl?

Financial aid: the G7 and the European Union promised help to shore up the ruined reactor's shelter and to finish two replacement reactors, though the money was slow to arrive.

UN scientists compare the 20-year radiation dose of people who stayed in Chernobyl's contaminated areas to one what?

CT scan: the average came to about 9 millisieverts over two decades, the dose of a single scan, which is why UN reviews found little effect on general health beyond thyroid cancer.

Who directed the HBO/Sky miniseries Chernobyl?

Johan Renck began as a pop singer, scoring a 1993 hit under the name Stakka Bo, before turning to music videos and television; he directed every episode and won the 2019 Emmy for it.

A 2005 UN report called what Chernobyl's biggest health problem?

Mental health: the report blamed years of poor information for anxiety, fatalism and dependency among people in the affected areas, a wider burden than the radiation itself.

Which actor played scientist Valery Legasov in HBO's Chernobyl?

Jared Harris played Legasov in his own English accent: the series dropped Russian accents early on because, its writer said, actors end up acting the accent instead of the person.

Which actor won a Golden Globe for playing Soviet official Boris Shcherbina in the 2019 miniseries Chernobyl?

Stellan Skarsgård won the Golden Globe for best supporting actor for the role; like the rest of the cast he kept his natural accent, because the makers ruled out Russian ones.

Which Icelandic composer wrote the score for HBO's Chernobyl?

Hildur Guðnadóttir built the score from sounds she recorded inside the disused power plant where the series was filmed, without conventional instruments; it won her an Emmy and a Grammy.

Soon after it aired in 2019, HBO's Chernobyl held the highest-ever score for a TV show on which website?

IMDb: viewers' votes sent it to the top of the site's TV ratings within weeks, even as Russian state television attacked it.

A Russian TV drama reported in 2019 put a spy from which organisation at Chernobyl on the night of the disaster?

The CIA: weeks after HBO's series aired, Russian state channel NTV was reported to be making a drama in which an American agent is at the plant on the night of the explosion, a break with the historical record.

Roughly what did the international plan to enclose Chernobyl's ruined reactor cost in total?

Around €2.15 billion: the plan was first costed at well under a billion dollars, but years of delays and overruns on the arch, which alone took €1.5 billion, pushed the bill far higher.

Which international lender managed the Chernobyl Shelter Fund?

The EBRD managed the fund that paid for the giant arch over the ruined reactor and, when the donors' money fell short, put in its own to finish the job.

What nickname stuck to the steel-and-concrete shell thrown up over Chernobyl's reactor 4 in 1986?

The Sarcophagus: officially the Shelter Object, it went up in a hurried 206 days and was neither strong nor durable, which is why a far larger arch was later built to cover it.

Roughly how many tons of once-molten nuclear fuel debris remain inside Chernobyl's ruined reactor building?

About 200 tons of the lava-like mix of fuel and melted reactor structure still lie inside, which is why the ruin has to stay sealed until machines can dig it out.

In February 2025, what punched a hole in the roof of Chernobyl's New Safe Confinement?

A drone strike: it breached both layers of the arch's cladding and started a fire in the insulation between them, and the arch lost its main confinement function.

Valery Legasov was first deputy director of which atomic energy body?

Legasov was first deputy director of the Kurchatov Institute of Atomic Energy in Moscow from 1983, under Anatoly Aleksandrov, despite being an inorganic chemist rather than a reactor physicist.

Which honour did Boris Yeltsin award Valery Legasov posthumously in 1996?

Hero of the Russian Federation, the country's highest title, came in September 1996, eight years after Legasov died; the Soviet state had passed him over for Hero of Socialist Labour after Chernobyl.

Which everyday food did most to carry Chernobyl's fallout into children's thyroid glands?

Milk: cows ate contaminated grass and passed the fallout on in their milk, and it lodged in children's small thyroid glands, a major cause of the later surge in thyroid cancers.

Anatoly Dyatlov was released from prison in 1990 for what reason?

Health concerns: Dyatlov had taken a heavy radiation dose on the night of the accident, and he was freed early in 1990 with his health failing.

Dyatlov received what sentence at the 1987 trial?

The maximum ten years in a labour camp went to Dyatlov, Bryukhanov and Fomin alike; the court sat inside the evacuated zone, in the town of Chernobyl's Palace of Culture, and convicted all six defendants.

Before joining Chernobyl, Anatoly Dyatlov spent years in the Soviet Far East installing reactors in what?

Submarines: Dyatlov led a team at a secret Far East laboratory fitting reactors into the Soviet nuclear fleet, and the military manner he brought with him grated on Chernobyl's young civilian staff.

Who ran the Chernobyl plant as director from the start of its construction in 1970 until the disaster?

Viktor Bryukhanov was 34 when he was sent to build the plant on a snowbound empty field; he ran it for sixteen years and was arrested within months of the explosion.

Which chief engineer of the Chernobyl plant approved the fatal safety test and stood trial with its director in 1987?

Nikolai Fomin, chief engineer from 1981, signed off the test programme; his suicide attempt in custody delayed the trial, and he was later moved from prison to a psychiatric hospital.

Why was Chernobyl's safety test pushed back about nine hours, leaving it to the night shift?

Kyiv's grid needed the power: its controller held the plant at half output until about 23:00, so a test planned for the day shift fell to the night crew instead.

Alarms at which nuclear plant on 28 April 1986 gave the outside world its first sign of Chernobyl?

Forsmark's monitors tripped on the morning of 28 April, more than 1,000 km from Chernobyl; staff hunted for a leak in their own plant, found none, and the hunt for an outside cause forced Moscow to admit the accident.

Which Soviet leader later wrote that Chernobyl was perhaps the main cause of the USSR's collapse five years on?

Mikhail Gorbachev wrote in 2006 that the accident, even more than his perestroika, perhaps did most to bring the Soviet Union down: the clean-up drew in over 500,000 people and drained the state's funds.

Chernobyl released roughly how many times more radioactive material than the Hiroshima bomb?

About 400 times as much radioactive material reached the atmosphere as from the Hiroshima bomb, yet the immediate death toll was a small fraction of Hiroshima's.

Which Ukrainian president ordered the final shutdown of reactor 3 in December 2000?

Leonid Kuchma gave the order by video link from Kyiv on 15 December 2000, and the reactor 3 operator pressed the shutdown button, ending electricity generation at the site.

By 2000, roughly how many people had been permanently resettled from the worst-hit areas?

About 350,000 people had been moved by 2000: some 116,000 in 1986 and about 220,000 more in later years, though a 2005 UN review found the later moves did little to cut radiation doses.

Which actress played Lyudmilla Ignatenko, the firefighter's wife, in the 2019 miniseries Chernobyl?

Jessie Buckley played Lyudmilla, whose own account of her husband's death, given years later for an oral history, was adapted for the series; the role won her an Irish Film and Television Academy award.

Chornobyl, the Ukrainian spelling of Chernobyl, is also a Ukrainian word for which plant?

Wormwood: chornobyl, literally 'black stalk', is a Ukrainian name for mugwort or common wormwood, and the town is usually said to be named after it, though the name may instead come from an old personal name.

What kind of dark, melanin-rich organism was found thriving inside Chernobyl's ruined reactor 4?

Fungi rich in dark melanin were found growing inside reactor 4, some of them reaching towards radioactive graphite; one species was later sent to the International Space Station for radiation tests.

In 2016 Ukraine gave most of its Chernobyl exclusion zone which protected status?

A biosphere reserve was declared on the thirtieth anniversary of the disaster, turning land emptied of people because of contamination into one of Europe's larger protected wildlife areas.

Four years before the disaster, what happened at Chernobyl's reactor 1 and was hushed up?

A partial core meltdown in 1982 released radioactive material and put reactor 1 out of action for months; it was covered up and not made public for years.

Chernobyl first appears in a chronicle entry for 1193, when the town belonged to which medieval state?

Kievan Rus': the 1193 entry is said to describe Chernobyl as a hunting lodge of Prince Rurik Rostislavich in the Kyiv principality, almost eight centuries before a nuclear plant took its name.

Under the Twersky dynasty, 18th-century Chernobyl became a major centre of which religious movement?

Hasidic Judaism: Rabbi Menachem Nachum Twersky founded a dynasty whose rebbes still carry the town's name in Israel and the United States, long after pogroms, emigration and war ended Jewish life in the town itself.

What was the 'Russian Woodpecker' radar near Chernobyl built to detect?

Ballistic missile launches: the giant early-warning array ran from 1976 to 1989, and its tapping pulses disrupted shortwave radio so widely that it drew thousands of complaints from many countries.

Which band shot part of the 2014 video for its instrumental Marooned in the abandoned city of Pripyat?

Pink Floyd marked twenty years of The Division Bell with a new Marooned video, for which director Aubrey Powell cut footage of Pripyat's empty buildings with views from the International Space Station.

At what frequency did the tapping of the 'Russian Woodpecker' radar signal repeat?

10 Hz, ten taps a second, gave the signal its woodpecker sound; it disrupted broadcasts so badly that some radio receivers were built with 'Woodpecker Blanker' circuits to cut it out.

Which giant fish, featured on TV's River Monsters, lives in the Chernobyl plant's cooling pond?

Wels catfish live in the plant's cooling water: Jeremy Wade went looking for a rumoured radioactive mutant and caught one there for a River Monsters episode titled Atomic Assassin.

Which building in Pripyat did clean-up crews keep using for about a decade after the evacuation?

The Azure swimming pool stayed open for crews working in the zone, who swam there to unwind after their shifts; since it closed it has been left to decay.

What forced Chernobyl's reactor 2 to shut down for good in 1991?

A turbine hall fire in October 1991 ended reactor 2's working life: it never ran again, leaving only reactors 1 and 3 in service beside the ruined fourth.

Roughly how large is the patch of pine forest beside the Chernobyl plant that radiation killed in 1986?

About ten square kilometres of pine, some four square miles, died after soaking up the heaviest fallout; saplings planted over the site have since grown into young woodland.

What did clean-up crews do with most of the pines killed by radiation beside the Chernobyl plant?

Bulldozed and buried them: the dead trees went under the soil and new ones have grown over the site, so the woodland there today is younger than the disaster.

Which pump operator, the first to die at Chernobyl, was never found and remains entombed in reactor 4?

Valery Khodemchuk was in the main pump hall when the reactor exploded; searches that night failed, and a memorial to him is set into a wall of the structure built over the ruin.

Which isotope released at Chernobyl has a half-life of about 24,000 years?

Plutonium-239 has a half-life of about 24,000 years: shorter-lived fallout fades within centuries, but the plutonium near the plant is why estimates for safe resettlement there run to more than 24,000 years.

Who wrote Midnight in Chernobyl, the 2019 history of the disaster?

Adam Higginbotham built the book on more than a decade of interviews with eyewitnesses and on newly declassified archives; it won the 2020 Andrew Carnegie Medal for nonfiction.

Where was the Chernobyl Forum founded in February 2003?

IAEA headquarters in Vienna hosted the founding meeting; the Forum's 2005 report found that poverty posed a far greater threat to local communities than radiation exposure did.

Where was firefighter Vasily Ignatenko buried after dying of radiation sickness?

Mitinskoe Cemetery, Moscow, holds Ignatenko beside the other firefighters and plant workers who died of radiation sickness in the city; he was buried with military honours in a zinc coffin set inside a wooden one.

Ignatenko's widow Lyudmilla told her story to which Nobel-winning author?

Svetlana Alexievich, winner of the 2015 Nobel Prize in Literature, gathered Lyudmilla's account for her 1997 oral history of the disaster, and the 2019 miniseries built its firefighter storyline on it.

Which German band added Chernobyl to the lyrics when it re-recorded its 1975 song Radioactivity in 1991?

Kraftwerk turned a song that had played on radio waves into an anti-nuclear protest for The Mix, dropping the radio puns and naming Chernobyl beside Harrisburg, Sellafield and Hiroshima.

Fire commander Leonid Telyatnikov was awarded which top honour in 1986?

Hero of the Soviet Union went to Telyatnikov for leading the firefighters on the reactor roofs; he survived a heavy dose, rose to major-general, and died of cancer in 2004, aged 53.

Under what title did Penguin publish its 2016 translation of the oral history first known in English as Voices from Chernobyl?

Chernobyl Prayer is the literal meaning of the Russian title, Chernobylskaya molitva, which Anna Gunin and Arch Tait restored in their new translation after earlier English editions had dropped it.

Which IAEA chief, later the UN's chief weapons inspector in Iraq, toured the wrecked Chernobyl plant in 1986?

Hans Blix led the IAEA from 1981 to 1997 and visited the plant within weeks of the explosion; in 2003 his UN inspectors reported finding no weapons of mass destruction in Iraq.

Which Paranormal Activity creator co-wrote and produced the 2012 film Chernobyl Diaries?

Oren Peli, the writer-director of Paranormal Activity, came up with the story and produced; the film strands its characters in abandoned Pripyat, though much of it was shot in Hungary and Serbia, and it took over $37 million.

Which Strugatsky brothers novel lent its background and terminology to the S.T.A.L.K.E.R. games?

Roadside Picnic gave the games their stalkers, trespassers who slip into a forbidden Zone to bring out its strange artefacts; the games moved that Zone from an alien landing site to Chernobyl.

Which Ukrainian studio developed S.T.A.L.K.E.R.: Shadow of Chernobyl?

GSC Game World, a Kyiv studio, took so long over the game that some wrote it off as vaporware, and an unfinished build leaked online in 2003, four years before THQ finally published it.

What is the subtitle of the 2024 game S.T.A.L.K.E.R. 2, set in the exclusion zone?

Heart of Chornobyl uses the Ukrainian spelling of the town's name; Russia's 2022 invasion halted work on the game, and it came out in November 2024, fifteen years after the series' previous title.

In which Oscar category did the 2003 film Chernobyl Heart win?

Chernobyl Heart, directed by Maryann DeLeo, won the Academy Award for Documentary Short Subject at the 2004 ceremony; its title refers to the heart defects seen in children of the region.

Which Irish charity founder appears in Chernobyl Heart?

Adi Roche started her children's charity after a 1991 fax from doctors in the fallout zone pleading 'help us get the children out'; in the film she travels with director Maryann DeLeo through the hospitals it supports.

Which 1988 disaster was the head of Chernobyl's government commission sent to manage next?

The Armenian earthquake of December 1988 killed tens of thousands and drew rescuers and aid from more than a hundred countries; Chernobyl's commission chief headed a new commission on its aftermath.

Before Chernobyl, the head of the government commission made his name developing which industry in Siberia's Tyumen region?

Oil and gas: as party chief in Tyumen for twelve years he drove the opening of the West Siberian fields, then spent a decade as the minister building the industry's plants and pipelines.

Which actor, Oleg in TV's Vikings, directed and starred in the 2021 Russian film Chernobyl: Abyss?

Danila Kozlovsky cast himself as an invented firefighter drawn into the clean-up, not as any real figure from the disaster; abroad the film was sold as Chernobyl 1986.

What colour are the gondolas of Pripyat's abandoned Ferris wheel?

Yellow gondolas hang from a wheel that became a symbol of the disaster; in 1986 the air crews flying the drops onto the burning reactor used the open ground beside it as a landing strip.

Which safety system did the operators switch off before starting the rundown test?

The emergency core cooling system was isolated hours earlier, as the test programme itself required, so that it could not cut in and interrupt the run; investigators later judged that lax safety culture, not a cause of the accident.

Why did only one of Igor Kostin's first photographs of the wrecked Chernobyl reactor survive?

Radiation ruined the film: Kostin's camera motors failed after about twenty frames, and when the rolls were developed all but one had turned black, as if exposed to light.

How did Igor Kostin reach the plant to take his first photograph of the ruined reactor?

By helicopter: a pilot he often worked with tipped him off about a fire at the plant and flew him there, arriving after the flames were out.

Which 1957 accident is the only one rated Level 6 on the INES scale?

The Kyshtym disaster of 29 September 1957 was a chemical explosion in a tank of liquid nuclear waste at the Mayak plutonium plant; it was kept secret in the USSR for decades.

Each step up the INES scale, where Chernobyl is a 7, marks an accident about how many times more severe?

Ten times: the scale was built to be logarithmic, like the magnitude scale for earthquakes, and was introduced in 1990, four years after the accident that sits at its top.

Which American reactor accident sits at Level 5 on the INES scale, two steps below Chernobyl?

Three Mile Island's 1979 accident melted part of one reactor's fuel, which is what earns Level 5, an 'accident with wider consequences', whatever the size of the release.

Which Soviet ally gave free medical care at a beach resort to thousands of children from the Chernobyl region?

Cuba opened the programme in 1990 at Tarará, a seaside resort near Havana, and kept it going through its own economic crisis after the Soviet collapse; over 18,000 Ukrainian children had been treated by 2009.

What nickname is given to reactor 4's upper biological shield, formally known as Scheme E?

Elena, formally Scheme E, is the steel-and-concrete lid that the explosion flung up through the reactor hall; the twisted fuel channels still hanging from it are known as Elena's hair.

Who commanded the first firefighter brigade on the scene, dying of radiation sickness two weeks later?

Volodymyr Pravyk, a 23-year-old lieutenant, led the plant's own fire brigade onto the roofs within minutes; nobody had told his crew how radioactive the smoke and debris around them were.

When buses arrived to evacuate Pripyat on 27 April 1986, how long were residents told they would be away?

About three days was the official line, so residents took little more than their documents; most never lived in their homes again and could collect a few belongings only months later.

Roughly how many flights did air crews make to drop material onto Chernobyl's burning reactor?

About 1,800 flights, 1,927 by one count, were made in the ten days after the explosion, and the crews who flew them took heavy doses of radiation.

At Chernobyl, how long did the control rods take to travel the full 7-metre height of the reactor core?

18 to 20 seconds was far too slow for an emergency: the rods crawled down at 0.4 metres a second, and after the accident reactors of this design were modified to cut the insertion time to about 12 seconds.

What had operators done with nearly all 211 of reactor 4's control rods before the test, against the rules?

Withdrawn them from the core: to drag the power back up after it slumped, the crew pulled out rod after rod, leaving the equivalent of about eight where the rules demanded at least fifteen.