I arrived in the Chornobyl Exclusion Zone in October 1991 – a 28-year-old graduate student from MIT carrying an Apple Macintosh computer. I soon realized my laptop had more computing power than the few older-model IBM PCs belonging to the entire research team. I had no Western colleagues, no predecessors whose work I could build on. The researchers bombarded me with questions about publishing their findings in the West.
About 30 scientists worked inside the Zone, struggling with what one of them called an “invincible” bureaucracy. None had formal training in nuclear reactor systems or accident analysis. Most were physicists who had learned on the job. Aleksandr Borovoi, the lead Russian scientist directing research at the destroyed reactor, was a neutrino physicist by training. He and his colleagues were competent and courageous – they sometimes collected samples of melted fuel with gloved hands or carried monitoring equipment into lethally radioactive areas because no other means existed. But the Soviet system had not deemed it necessary to send nuclear engineers to study its worst nuclear engineering failure.
The Exclusion Zone was administered by overlapping organizations with unclear jurisdictions. One entity, NVO-Pripyat – originally a division of the Soviet Ministry responsible for nuclear weapons – had appointed itself gatekeeper. It charged exorbitant fees to visiting researchers, organized sightseeing excursions to the Sarcophagus for paying Western tourists, and bureaucratically interfered with the work of legitimate scientists. Contaminated helicopters, fire trucks, and military vehicles sat rusting in open-air “machine graveyards” surrounded by barbed-wire fences with holes in them. Workers routinely cannibalized this radioactive equipment for spare parts. I often tagged along.
The EBRD's Middle East package won't affect investments in Ukraine, while the bank meanwhile races to repair Chornobyl's drone-damaged metal sarcophagus, EBRD's VP tells Kyiv Post.
The bureaucratic obstruction extended to outright interference with public accountability. In November 1991, shortly after my arrival, Academician Ihor Yukhnovsky – then a Ukrainian presidential candidate – came to the Zone on a pre-election fact-finding trip, accompanied by a television crew. He intended to visit the Sarcophagus and ask pointed questions about the station’s condition.
NVO-Pripyat officials organized three vehicles: one for Yukhnovsky and his aides, one for specialists from Kyiv with whom I rode, and one for the television crew. Yukhnovsky’s car departed first because the camera crew’s vehicle had “not yet arrived.” It never arrived. The crew was asked to leave the Zone. Yukhnovsky’s car then conveniently ran out of gas on the road to the power station. Fortunately, a passing driver siphoned gasoline from his own truck to get them moving. They arrived half an hour late – but were still the first to arrive, because the third car had taken a “different route.” No television interview was ever conducted. The organization controlling the Zone had no interest in a presidential candidate asking the right questions on camera.
Systematic suppression of information
The cover-up reached far beyond the technical details of the accident. Harvard physicist Richard Wilson, speaking at the first International Sakharov Conference in Moscow in 1991, cataloged specific methods by which Soviet authorities controlled information about Chornobyl’s consequences.
On Legasov’s instructions, officials removed about six pages concerning radioactivity released over Belarus from the official report just before the August 1986 IAEA meeting. The Soviet Central Committee directed the excision of pages detailing large deposits of radionuclides in Russia’s Bryansk region. The KGB confiscated dosimeters belonging to physicians and private individuals who had worked in the aftermath. Authorities forbade the publication of unauthorized radiation measurements as late as 1990.
Soviet health authorities forbade Ukrainian and Belarusian physicians from mentioning radiation in their diagnoses. Officials in Belarus suppressed appeals by private citizens in May 1986, urging that children not be allowed to drink milk, fearing it would incite panic. Health records of the liquidators – the soldiers and workers who built the Sarcophagus and conducted cleanup – vanished after their service was completed. Much of this documentation only resurfaced after the Soviet Union collapsed.
The IAEA’s role
The IAEA’s response to Chornobyl raises questions that have never been adequately answered. In 1986, the Agency’s International Nuclear Safety Advisory Group produced its first official review – the report known as INSAG-1. It endorsed the Soviet account, concluding that “accident management actions taken at Chornobyl were, generally, quite successful”. The helicopter drops, INSAG-1 stated, “stabilized the situation at an early stage.”
But by 1990, the IAEA itself had sponsored a report by Borovoi – one of the key Russian scientists investigating the accident from inside Unit 4, and the man who had invited me to join the research team. His data showed that the helicopter materials had not covered the core. The Agency had this information a full year before publishing its much-criticized 1991 report on the accident’s health effects. What, exactly, was the Agency verifying?
The IAEA’s dual mandate created a structural conflict of interest. It was charged with both promoting nuclear energy worldwide and regulating its safety. Acknowledging that the Soviet helicopter campaign had failed would have undermined the IAEA’s own endorsements, called its competence into question, and damaged the credibility of a global nuclear industry already wounded by both Chornobyl and the lingering effects of Three Mile Island. Russia, which operates 11 Chornobyl-type RBMK reactors, played a significant role in the IAEA’s governance. Letting the accident fade into history served Russian interests.
“I can vouch for the fact...”
In early 1994, my research – conducted at MIT under the supervision of Norman C. Rasmussen and based on 18 months of fieldwork at Chornobyl – produced a detailed forensic reconstruction of the accident’s “Active Phase” that contradicted the Soviet account at nearly every turn. Borovoi had invited me to join the Chornobyl Complex Expedition as a research associate. No Western nuclear engineer had received such access before, and none has since.
The IAEA dismissed the findings. Morris Rosen, the Agency’s Deputy Director-General and head of its Division of Nuclear Safety, told a reporter that he had personally flown over the reactor site in May 1986. “I can vouch for the fact,” he said, “that the material certainly got into the core region.” An Agency spokesperson called my peer-reviewed research “flawed and not worthy of serious attention.”
Rosen’s claim didn’t withstand scrutiny. He hadn’t flown directly over the destroyed reactor. The Soviets would not have permitted a Western official to overfly a site of such military-industrial sensitivity with high radiation fields, and one of the helicopter pilots later confirmed this for me. From a distance, through a helicopter window, Rosen could observe the wreckage’s exterior – smoke, glow, piled material. Whether dumped material had penetrated a destroyed reactor cavity is a question that demands analysis of core-material samples, radiation measurements, and thermodynamic modeling – not a distant aerial impression. My research had been peer-reviewed and published as a three-part series in Nuclear Safety, a technical journal sponsored by the US Nuclear Regulatory Commission. It drew on about 200 bore samples, extensive photographic documentation, robotic observations, and radiochemical analyses. Rosen offered an autobiography in place of data.
Russian pride and nuclear safety
The pattern of institutional obstruction was not limited to IAEA bureaucrats. At a 1996 IAEA conference marking the accident’s tenth anniversary, I sat three rows behind Evgeny Adamov – I was there representing the Nuclear Safety Account of the EBRD – as an expert panel presented further recommendations for RBMK safety improvements. Adamov leaped to his feet, screaming Khrushchev-style, to berate the panelists. Their offense? Suggesting that Russian reactors needed additional safety upgrades.
Panel members were visibly shaken. Reasonable safety recommendations were watered down. After the session, the Russian delegation congratulated Adamov for putting the experts in their place – clapping him on the back with “Atta boy, you gave it to them!”
This was the man responsible for the safety of Russia’s nuclear power industry, including its eleven remaining RBMK reactors. In 2005, Russian authorities arrested Adamov on charges of fraud and abuse of power related to the diversion of nine million dollars that the US Department of Energy had given Russia to improve security at its nuclear facilities. A Russian court convicted him in 2008; a higher court later suspended the sentence. His conduct at the 1996 conference – suppressing legitimate safety recommendations through intimidation – illustrated the same institutional pathology that had produced the accident a decade earlier. Russian pride-of-ownership, as in 1986, trumped engineering prudence.
The system that built the bomb
The lies surrounding Chornobyl were not aberrations. They were expressions of a regime that had spent decades forcing reality to serve ideology. Anatoly Aleksandrov, president of the USSR Academy of Sciences and a chief proponent of the RBMK reactor design, had publicly assured the Soviet leadership that nuclear reactors were “so safe that they can be built on Red Square.” After Three Mile Island, Aleksandrov declared that such an accident could only happen in America, “where they put profits ahead of safety.”
The RBMK design embodied this culture. It had a positive void coefficient – meaning that if coolant boiled, nuclear reactions accelerated rather than slowed. It lacked a containment structure, the reinforced-concrete shell that in Western reactors serves as a final barrier against radioactive releases. These were not oversights. They were consequences of a system that prioritized rapid deployment, dual-use capability, and cost minimization over safety.
In the West, the IAEA’s failure to challenge the Soviet account served analogous institutional purposes. Admitting that its early endorsements were wrong would have forced the Agency to confront its own lack of independent verification. The nuclear industry, East and West, shared an interest in containing reputational damage. East and West converged on the same convenient fiction – and the physical evidence inside Unit 4 contradicted it from the start.
The cover-up cost lives. Every day the lie persisted – that the core had been smothered, that releases were limited to 50 million curies, that the situation was under control – was a day in which affected populations were denied the full truth about their exposure. Soviet health authorities forbade physicians in contaminated areas from linking diagnoses to radiation. Children in Belarus drank contaminated milk because officials suppressed the warnings. Liquidators received radiation doses whose records subsequently vanished.
In 1987, before reliable health data had been gathered, the IAEA reassured the world: “If anything, there will be a modification downward of early calculations of risks and predictions of health consequences.” The statement was premature and, as subsequent evidence showed, incorrect. Marked increases in childhood thyroid cancers appeared in Belarus and Ukraine, linked to releases of radioactive iodine that the official account had dramatically underestimated. At the August 1986 meeting, Morris Rosen had offered his own reassurance: “Chornobyl shows us that even in a catastrophic accident, we are not talking about unreasonable numbers of deaths.”
The liquidators – soldiers and civilians pressed into service to build the Sarcophagus and decontaminate the surroundings – were used to create an impression that something effective was being done. These men were brave. They were also, in many cases, unwitting participants in a deception. Some were former political dissidents and prisoners forced to participate in cleanup operations. Their sacrifices were real. The narrative built upon those sacrifices was not.
A long vindication
For years after I published my findings, the IAEA and various Russian officials continued to dismiss or ignore them. The Agency’s INSAG-7 report in 1992 partially corrected the original INSAG-1 account – shifting blame from operators to reactor design flaws and a weak Soviet safety culture – but even that revision didn’t go as far as the physical evidence warranted in addressing what had happened during the ten days of massive releases.
The correction came slowly, without fanfare. In 2003, an OECD publication referenced my work, strengthening Borovoi’s earlier conclusion that the helicopter materials had not reached the core. In 2021, Elsevier invited me to write the sole-authored chapter on the Chornobyl accident for its “Encyclopedia of Nuclear Energy,” a comprehensive reference edited by Ehud Greenspan of UC Berkeley. That chapter synthesizes roughly three decades of research: the MIT dissertation, the three-part “Nuclear Safety” series, and ongoing analysis. That the nuclear engineering community’s authoritative encyclopedic reference now carries my reconstruction as its definitive Chornobyl entry is, for me, less a personal triumph than a vindication of the evidence itself – evidence gathered at considerable risk by Borovoi, his colleagues, and the small team of scientists who never stopped working inside the ruins.
My work at Chornobyl was never purely technical. What I witnessed in the Exclusion Zone was not merely a destroyed reactor but the pathology of a failed regime – a system in which lying was formalized, accountability was punished, and truth was treated as a threat to the state. The Chornobyl deception was not an anomaly. It was the system working as designed.
The deception continues
On Feb. 14, 2025, a Russian Shahed-type “Geran-2” kamikaze drone struck the New Safe Confinement – the billion-dollar arch that the international community had built over the Sarcophagus to contain the radioactive remains of Unit 4 for 100 years. The outer wall was penetrated. The inner wall was damaged. Fires broke out in the insulation layer. By December 2025, the IAEA confirmed that the structure had “lost its primary safety functions, including the confinement capability”.
Russia denied responsibility, which should come as no surprise. The Kremlin spokesman declared that “our military doesn’t do that” – even as Ukrainian forces recovered fragments of the Shahed drone at the site, and even as 133 Russian drones struck Ukrainian targets that same night. Analysis by McKenzie Intelligence Services, cited by The New York Times, concluded that the Shahed’s preset guidance system indicated “almost certain deliberate targeting”. The Chornobyl plant director, Serhii Tarakanov, warned that another strike – even a near miss – could cause the inner shelter to collapse entirely. Full restoration, he estimated, would take three to four years.
The structure that took a decade to finance and build, designed to last a century, was functionally broken by a single drone in less than seven years. And the state that built the reactor, caused the meltdown, lied about it for a decade, and obstructed every effort at accountability, is now physically destroying the containment that the rest of the world paid to erect. This is not irony. It is continuity.
What Chornobyl reveals
The Chornobyl deception was not the work of a few dishonest individuals. Interlocking institutional interests – Soviet, Russian, and international – found it more convenient to ratify a false narrative than to confront the physical evidence inside a shattered reactor building. Soviet officials lied because the system demanded it. The IAEA endorsed the lie because challenging it would have exposed the Agency’s own failures. The nuclear industry acquiesced because another acknowledged catastrophe was commercially intolerable.
The physical evidence does not lie. The core shaft is empty. The corium lies in the lowest four floors of the reactor building. The helicopter material stands in a mound, between 10 and 25 meters above the corium, in the Central Hall, 12 meters from where it was supposed to land. The Igla detector wand protrudes from a spent-fuel pool, recording data from a location no one thought to question. The isotopic release profile is isothermal when it should not be. The cube root of the claimed concrete volume exceeds the dimensions of the building it was supposed to fill.
These are not ambiguities requiring interpretation. They are arithmetical facts, chemical signatures, and physical locations. They cannot be spun, reclassified, or overridden by institutional authority. And now, from the hole torn in the New Safe Confinement by a Russian drone, they are once again exposed to the sky. Forty years after the accident, the evidence remains exactly where the cover-up left it – silent, stubborn, and unanswerable.
Alexander Sich holds a PhD. in Nuclear Engineering from MIT and an MA in Soviet Studies from Harvard. He authored the Chornobyl chapter in the “Encyclopedia of Nuclear Energy” and was the first Western nuclear engineer permitted to live and work with the Russian and Ukrainian scientists studying the destroyed reactor inside the Chornobyl Exclusion Zone, where he spent 18 months conducting research underpinning this article.
