Sitting on the Dnipro River in Russian-occupied Ukraine is Europe’s largest nuclear power station – on the frontline of a worsening war.
Over a period of a few weeks we spoke to two workers at the Zaporizhzhia plant.
And the warnings they gave of what could happen should send a cold chill around the world.
The interviews were conducted on the condition of anonymity and at great personal risk to them. They told us that if they were caught, they could be tortured, imprisoned, or worse. They know the dangers but still wanted to be heard.
Neither of the technicians knew that we were talking to the other. But their testimony of the possibility of a major nuclear catastrophe was worryingly familiar. One of the men, who we will call Serhii, warned the consequences could cause devastation across much of Europe, Russia and the Mediterranean.
“The level of radioactive pollution, and most importantly the area of contamination, will be thousands of square kilometres of land and sea… it would be much, much worse than Fukushima and worse than Chernobyl.”
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While some nuclear experts think that such an eventuality is unlikely, others have told us it’s a possible worst case scenario.
The Zaporizhzhia nuclear plant was captured by Russian forces in March last year at the beginning of Moscow’s invasion of Ukraine. Since then there have been major concerns about safety at the plant. Not least of all because heavy weapons, including shells and rockets, have hit the buildings.
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Both sides blame each other. But our sources told us that Russia has been deliberately targeting power lines to disrupt the flow of electricity to Ukraine. These lines are essential for plant safety and the cooling mechanism of the reactors.
For 30 years, workers at Europe’s largest nuclear power station couldn’t imagine that there could be a power outage.
Since Russian forces occupied the site last year it has happened seven times.
The back-up generators we were told are also not being properly maintained, the other man, Mykola, told us that this was because of staff shortages.
He says that before the war there were 11,000 staff at the plant and now there may be as few as 3,500.
“There is the same deficit of workers for repairs who can actually do the servicing and fix problems. The quality of the workers is lower because the qualified staff left. So generally the situation here is deteriorating.”
Five of the six reactors are now in cold shutdown, but there are fears Russia may use the power plant to stage a false flag attack.
Ukraine’s defence ministry alleges Moscow could be about to simulate a major accident, such as a radioactive leak, as a way of stopping any Ukrainian counteroffensive in the south of the country.
Image: Satellite view of Zaporizhzhia nuclear power plant on fire
Ukraine is expected to order its troops to reclaim territory lost at the beginning of the war in the coming weeks.
The power station has been under occupation now for 15 months and the technicians have told us that in the last few weeks the level of military activity has increased dramatically.
They’ve witnessed Russian forces, moving more armour, more ammunition and more guns into place as they fortify their positions.
Serhii says that he thinks it’s because they know the nuclear plant is safe from Ukrainian strikes.
“Ukrainian armed forces will not shell the station. That’s why they are multiplying the numbers of troops and vehicles here because if they did it in another place they would definitely get shelled by the armed forces of Ukraine.
“The thing is, one month and half ago there were two times less troops on the power station and now there are two times more which means they are definitely preparing for the counteroffensive.”
Image: The men spoke to Sky News about their experience at the plant
Mykola told us it’s a frightening place to work, but he has no choice.
“Everyone has their own story. And I think the most important thing is not to get into their hands because it’s unlikely you will get out and still be the human you were when you went in.”
The International Atomic Energy Agency is carrying out inspections, but it continues to express grave concerns about the nuclear plant and is calling for the area to be demilitarised immediately.
But there is no sign that will happen. In fact, it’s quite the opposite.
The Vatican shared the Pope’s final testament, in which he outlined his request to be buried “in the ground, without particular ornamentation” but with the inscription “Franciscus”.
Francis said he wished to be buried in Rome’s Basilica of Saint Mary Major, rather than at St Peter’s Basilica in the Vatican, where many previous pontiffs have been laid to rest.
An anonymous benefactor will pay the cost of the funeral, according to the Vatican.
The Pope’s coffin might be moved to St Peter’s Basilica as early as Wednesday morning to allow the faithful to pay their respects, a Vatican spokesman said.
Francis had suffered from a chronic lung disease and had part of a lung removed as a young man.
Health issues plagued him throughout his later life, and he was admitted to Gemelli hospital in Rome on 14 February for a respiratory crisis that developed into double pneumonia.
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People react to the death of Pope Francis
This led to a 38-day stay in hospital, the longest of his 12-year papacy.
But the leader of the world’s Roman Catholics emerged on Easter Sunday, a day before his death, to bless thousands in St Peter’s Square.
Before the public appearance, the Pope “exchanged good wishes” with US vice president JD Vance during a private audience at the Vatican.
Bells tolled in church towers across Rome after the announcement of his death.
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Crowds gather at Vatican City
Francis, the first Jesuit and the first Latin American pontiff, charmed the world with his humble style and concern for the poor, but alienated conservatives with critiques of capitalism and climate change.
Seven days of mourning will be observed in his native Argentina, as well as in its heavily-Catholic neighbour, Brazil.
The King, who met Francis earlier this month during a visit to Italy with the Queen, described him as someone who had “profoundly touched the lives of so many”.
Charles said he and Camilla were “most deeply saddened” to learn of the Pope’s death and they “were greatly moved to have been able to visit him” so recently.
Prime Minister Sir Keir Starmer said Francis had been “a Pope for the poor, the downtrodden and the forgotten”.
A “simple” tomb “in the ground” bearing only the inscription “Franciscus” is among the Pope’s wishes for his burial, according to a final testament released by the Vatican.
Below is the Pope’s final testament in full, signed 29 June 2022.
Image: The Vatican shared the Pope’s final testament with his burial wishes. Pic: The Vatican
“As I sense the approaching twilight of my earthly life, and with firm hope in eternal life, I wish to set out my final wishes solely regarding the place of my burial.
“Throughout my life, and during my ministry as a priest and bishop, I have always entrusted myself to the Mother of Our Lord, the Blessed Virgin Mary. For this reason, I ask that my mortal remains rest – awaiting the day of the Resurrection – in the Papal Basilica of Saint Mary Major.
“I wish my final earthly journey to end precisely in this ancient Marian sanctuary, where I would always stop to pray at the beginning and end of every Apostolic Journey, confidently entrusting my intentions to the Immaculate Mother, and giving thanks for her gentle and maternal care.
“I ask that my tomb be prepared in the burial niche in the side aisle between the Pauline Chapel (Chapel of the Salus Populi Romani) and the Sforza Chapel of the Basilica, as shown in the attached plan.
“The tomb should be in the ground; simple, without particular ornamentation, bearing only the inscription: Franciscus.
“The cost of preparing the burial will be covered by a sum provided by a benefactor, which I have arranged to be transferred to the Papal Basilica of Saint Mary Major.
“I have given the necessary instructions regarding this to Cardinal Rolandas Makrickas, Extraordinary Commissioner of the Liberian Basilica.
“May the Lord grant a fitting reward to all those who have loved me and who continue to pray for me.
“The suffering that has marked the final part of my life, I offer to the Lord, for peace in the world and for fraternity among peoples.”
His arrival as pontiff heralded a new kind of leadership for the Catholic Church.
Described by some as the people’s pope, Pope Francis showed a willingness to welcome those who’d felt shunned by the Catholic faith, but as a reformer at heart, he also faced huge criticism from conservatives within the church.
The clash between the traditional and the liberal remains the greatest challenge to the legacy he leaves.
He was a pope of firsts: the first Latin American pontiff, the first Jesuit pope, the first to choose the name Francis.
Selected in just over a day by the papal conclave in March 2013, for some, the archbishop from Argentina, Jorge Mario Bergoglio, was an unexpected choice.
Image: Jorge Mario Bergoglio as a boy. Undated pic: Rex/Argenpress/Shutterstock
Image: The then Cardinal Jorge Mario Bergoglio on the subway in Buenos Aires in 2008. Pic: AP
The cardinals who chose him said he accepted the post with his trademark good humour.
“When the secretary of state toasted to him, he toasted back to us and said ‘I hope God forgives you’,” Cardinal Timothy M Dolan recalled at the time.
That sense of humour and his humility were characteristics which set him apart. He chose not to wear the more ostentatious papal clothing and turned down the traditional Vatican apartments for a more modest residence.
“Francis was not shy at all. He would always say funny things – crack a joke. He would also risk saying things that people in the first moment would be feeling as an insult, but then, when they looked at his cheeky face, they would also laugh,” rememberedProfessor Felix Koerner SJ, a theologian at Humboldt University in Berlin.
Born and raised in Buenos Aires, the son of Italian immigrants, after school he studied to become a scientist before being drawn to religion.
Spiritual leader to 1.4 billion Catholics, he was a symbolic figurehead on the world stage, meeting monarchs, presidents and prime ministers as he travelled the globe addressing huge crowds everywhere he went.
But while at ease in the presence of the rich and powerful, Pope Francis was never more comfortable than in the company of the poor.
His papal name was selected in honour of St Francis of Assisi for this very reason.
Image: The then priest in 1973. Pic: Rex/Argenpress/Shutterstock
Image: Argentina’s then Cardinal Jorge Mario Bergoglio gives a mass outside San Cayetano church in Buenos Aires in 2009. Pic: AP
“Cardinal Bergoglio had a special place in his heart and his ministry for the poor, for the disenfranchised, for those living on the fringes and facing injustice,” Vatican deputy spokesman Thomas Rosica explained.
Throughout his papacy, he was an outspoken champion of the deprived and a defender of those fleeing war and hunger.
Addressing the US Congress in 2015 he said: “Do unto others as you would have others do unto you, this rule points us in a clear direction; let us treat others with the same passion and compassion with which we want to be treated. Let us seek for others the same possibilities which we seek for ourselves.”
Image: Pope Francis kisses a baby as he arrives for a weekly general audience at the Vatican in October 2019. Pic: Reuters
On his numerous foreign trips, he sought out those in need, not afraid to visit struggling or violent areas.
In 2016, he washed the feet of refugees from various religious backgrounds at a migrant centre in a “gesture of humility and service”.
From climate change to the balance of wealth in the world, Pope Francis was not afraid to make his views known.
In 2015, he wrote Laudato Si (Praised Be), a major document on the need to protect the environment, calling the climate crisis a moral issue.
Addressing a congregation in 2023, he said: “We must side with the victims of environmental and climate injustice, working to put an end to the senseless war against our common home.”
Image: Pope Francis addressed a joint meeting of Congress on Capitol Hill in Washington in 2015, the first pontiff to do so. Pic: AP
Image: President Obama and Pope Francis. Pic: AP
Image: Pope Francis with Donald Trump at the Vatican in May 2017. Pic: Reuters
He was widely praised for his commitment to interfaith dialogue and was instrumental in an agreement between the Catholic Church and Islamic faiths.
In February 2019, Pope Francis and Sheikh Ahmed el-Tayeb, the Grand Imam of Al-Azhar, signed the Document On Human Fraternity For World Peace And Living Together.
He was also the first ever pope to travel to Iraq in 2021, an attempt to build bridges between different communities.
But it was his acceptance of the LGBTQ community that was unprecedented.
It began with an unexpected remark to reporters on a flight back from Brazil about gay clergy.
He said: “If a person is gay and seeks God and has good will, who am I to judge them?”
He later declared homosexuality was not a crime, part of his mission to make the Catholic Church more welcoming.
Image: Francis with Ukrainian President Volodymyr Zelenskyy in October 2024. Pic: Vatican via Reuters
Image: Pope Francis with the King (then Prince Charles) in 2019. Pic: Vatican via Reuters
“He was great in building relations and in risking being provocative to people. So he will remain in our memories a pope challenging people to live like Christ in simplicity,” said Professor Koerner.
However, events in later years left some feeling betrayed, for example, a landmark declaration allowing clerical blessings for same-sex couples was diluted.
In April 2024, he appeared to reiterate the Vatican‘s staunch opposition to gender reassignment, surrogacy, abortion and euthanasia, by signing the text “Dignitas Infinita” (Infinite Dignity).
In the same year, his own liberal credentials were questioned after reports he used a homophobic slur behind closed doors.
But despite that, others continued to insist he was still going too far with his progressive social views, and steering the Catholic Church away from more traditional values.
For the first time in six centuries, Francis had taken over from a living pope when Pope Benedict XVI stepped down due to his health in 2013.
Image: Pope Francis with Pope Emeritus Benedict XVI
Image: Pope Francis presiding over the funeral of his predecessor
His new tone compared to his predecessor, and efforts to reform, would set him on a collision course with his critics for going too far on both finances and policy.
Some would argue the opposition severely hampered his ability to go further with reforms around the involvement of women and the gay community.
Ruth Gledhill, assistant editor of The Tablet, said Pope Francis “did go to war with the conservative traditionalist side of the church. And it could be argued that it wasn’t entirely an effective battle or entirely a wise battle in some respects.
“I think what people will have to accept is even now in today’s world where everything happens so quickly, in the Catholic Church still, nothing happens fast.”
Claims of abuse within the church both in the past and present were a constant shadow for Pope Francis.
In 2018, he travelled to Irelandand apologised for the “crimes” committed by the church.
Image: Pope Francis visiting Phoenix Park in Dublin in 2018. Pic: AP
The victims included the tens of thousands of Irish children sexually and physically abused at Catholic churches, schools and workhouses, and the women who were forced to live and work in laundries and give up their children if they got pregnant out of wedlock.
“We ask forgiveness for those members of the hierarchy who didn’t take responsibility for this painful situation, and who kept silence,” Francis said to a crowd of 300,000 in Dublin.
“May the Lord keep this state of shame and compunction and give us strength so this never happens again, and that there is justice.”
In 2019, he issued a landmark decree making it obligatory for all priests and members of religious orders to report any suspicions of abuse, and holding bishops directly accountable for any attacks they commit or cover-up.
Image: Pope Francis met Queen Elizabeth II and Prince Philip in 2014. Pic: AP
In 2023, he extended the sex abuse rules to include lay leaders.
But some still feel not enough was done to root out the problem and hold to account known abusers.
Luke Coppen, senior correspondent at the Catholic website The Pillar, said: “Opinions differ about how successful he was or how much attention he paid to it. He certainly took several steps to combat that evil on a global scale. But critics again said that he didn’t do enough.”
Occasionally, during his time as pontiff, his temper frayed when he was in pain from illness or overwhelmed by an overexcited crowd.
In 2016, he scolded a person who pulled him down in Mexico, and in 2020 slapped the hand of a woman who refused to let go of his arm.
For many this only made him more human.
Image: On 21 February 2001, Archbishop Jorge Mario Bergoglio was elevated to cardinal by Pope John Paul II with the title of cardinal priest of San Roberto Bellarmino
At the time of his election, he also faced questions over whether he stayed silent about human rights abuses carried out by Argentina’s dictatorship while he lived there.
Critics alleged he failed to protect priests who challenged the junta earlier in his career, during the ‘dirty war’ between 1976 and 1983, and that he has said too little about the complicity of the church during military rule.
The Vatican strongly denied the accusations.
In his final years, increasing health issues meant more frequent hospital stays and more events cancelled, but even when sick, Francis continued to put others before himself to show the church was more open than before.
For example, while receiving treatment in hospital in 2023 he took time to visit ill children, baptise a baby and comfort mourning parents.
In 2024, he also invited 200 comedians to an audience at the Vatican and a year later appointed the first woman, Sister Simona Brambilla, to head up a major Vatican office.
In 2025, Pope Francis underwent a prolonged stay in hospital after being admitted on 14 February for respiratory issues that developed into double pneumonia.
He spent 38 days there – the longest hospitalisation of his 12-year papacy.
But he emerged on Easter Sunday, his last public appearance a day before his death, to bless thousands in St Peter’s Square after meeting with US vice president JD Vance.
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Pope blesses Easter crowds day before his death
Announcing his death on Easter Monday, Cardinal Farrell of the Vatican said: “Dearest brothers and sisters, with deep sorrow I must announce the death of our Holy Father Francis.
“At 7.35 this morning, the Bishop of Rome, Francis, returned to the house of the Father. His entire life was dedicated to the service of the Lord and His Church.
“He taught us to live the values of the Gospel with fidelity, courage and universal love, especially in favor of the poorest and most marginalised.
“With immense gratitude for his example as a true disciple of the Lord Jesus, we commend the soul of Pope Francis to the infinite merciful love of the One and Triune God.”
Bells tolled in church towers across Rome after the announcement of his passing.
As Catholics now mourn his passing, it is his humanity that Pope Francis will be remembered for; a pope of the people, never happier than when he was among them.