The Aberfan Disaster: The Avoidable Tragedy That Killed 116 Children
Updated: 6 days ago
At 9.15am on Friday 21 October 1966, a coal tip on the mountain above Aberfan gave way. Within minutes a wall of black slurry had buried Pantglas Junior School, a farm cottage and a row of houses. In all, 144 people died. 116 of them were children, most of whom had just sat down for the last morning of lessons before half-term.
It wasn't bad luck. People in the village had been worried about that tip for years, the organisation running it had been told in writing what could happen and an almost identical slide had happened just down the valley 27 years earlier. Sixty years on, here's the full story, including the parts that usually get left out: the warnings, the chapel that became a mortuary, the woman who died shielding five children, the bags of slurry dumped on a government floor and the fight that went on for decades afterwards.
Quick Answers
What happened? On 21 October 1966, colliery spoil Tip No. 7 slid down the mountainside and buried Pantglas Junior School and nearby houses in Aberfan, South Wales.
How many died? 144 people: 116 children and 28 adults, including five teachers. The youngest victim was three months old and the oldest was 82.
Who was to blame? The official tribunal put the blame entirely on the National Coal Board (NCB).
Was anyone punished? No. Nobody was prosecuted, sacked or demoted, and the NCB's chairman, Lord Robens, kept his job.
Who paid to remove the other tips? Partly the victims. £150,000 was taken from the public disaster fund and wasn't paid back until 1997.
Why is it back in the news? 21 October 2026 is the 60th anniversary, with a royal visit and new memorials planned.
A Village Living Under the Tips
Aberfan sits in the Taff valley, a few miles south of Merthyr Tydfil, and in 1966 it lived off the Merthyr Vale colliery. Coal paid the wages, and the waste from the pit had to go somewhere. Since the late 1860s it had gone up the mountainside behind the village, dumped in tips that got bigger every year. By the 1960s there were seven of them looming over the houses.
Wales already knew what the pits could take from a community. Just over 30 years earlier, the Gresford disaster near Wrexham had killed 266 men underground. Aberfan was different, though. This time the coal industry killed a school full of children above ground.
Tip No. 7 was started in 1958. By 1966 it stood 111 feet high and held nearly 300,000 cubic yards of waste, piled on porous sandstone with a spring running underneath, as the Smithsonian's account of the disaster lays out. Those springs weren't some hidden secret either. They were marked on Ordnance Survey maps, which the inquiry later pointed out (more on that below). And the tip sat directly above Pantglas Junior School, which had around 240 pupils, most of them aged seven to 11.
The Warnings Nobody Acted On
The really damning part is that the industry had seen this exact thing happen before. On 5 December 1939, after heavy rain, a tip at Albion Colliery in Cilfynydd, just down the Taff valley, slid hundreds of metres, crossed a road and blocked the canal, the railway and the River Taff. Around 163,000 tonnes of spoil moved. Nobody died, purely by luck. An engineer wrote a memo that same month on how colliery tips slide. It was then put in a drawer and forgotten until 1965, landslide expert Dave Petley has written.
Aberfan's own tips had form too. In October 1944, Tip No. 4 slid and carried spoil around 500 metres down the hillside. Tip 7 itself slipped in 1963, leaving a crater near the top, and the NCB denied that slide had even happened when it was questioned at the inquiry, according to Oxford politics professor Iain McLean, who spent years going through the official papers. In the six months before the disaster, the toe of the tip crept forward 20 to 30 feet, measured against a dead tree, and the top kept sinking.
After the 1963 slip, Merthyr council complained to the Coal Board about the danger from slurry being tipped behind the Pantglas schools. A council engineer wrote in June 1963 that he took it very seriously because "the slurry is so fluid and the gradient so steep." An NCB engineer said he'd been up to have a look. Nothing changed.
There was another pressure working against the village, too. Locals were reportedly warned that kicking up too much fuss could put the colliery's future at risk. In a valley where almost every family relied on the pit, that was enough to stop most people pushing.
The Morning of 21 October 1966
It'd rained heavily for days. When the tip gang climbed up at about 7.30am, they could see the top of Tip 7 had sunk. Crane driver Gwyn Brown later said he could barely believe what he was looking at. The men went to report it, but by then it was already too late.
At 9.15am the tip broke loose. The slurry came down the hillside as a wave around 30 feet high, and estimates of its speed run from 50mph to more than 80mph. Thick fog hid it, so most people in the village heard it before they saw it. Survivors later compared the noise to a low-flying jet or runaway trams rattling downhill. It wrecked a farm cottage and houses in its path, then smashed into four classrooms at Pantglas Junior School.
The children had only just got back to their desks after morning assembly. 109 children and five teachers died in the school. Headteacher Ann Jennings was among them. Her deputy, David Beynon, was found in the wreckage with five children in his arms, apparently trying to shield them.
Inside Pantglas School
The adults in the school that morning didn't die standing still. Nansi Williams was in the school hall that morning, believed to have been collecting dinner money, when the slurry came through the wall. Her godson Dai Powell is now campaigning for her to get proper recognition, and he told ITV in July 2026 that "she grabbed five children, lay on top of them." All five of those children lived. She didn't.
Eight-year-old Gaynor Madgwick was badly hurt and was dug out of the ruins by her own grandfather. Her brother Carl and her sister Marlyn were both killed. She spent the next 30 years trying to come to terms with it and eventually wrote about it in her 1996 book Struggling Out of the Darkness, as Tribune's review at the time explained.
The Last Child Out Alive
Jeff Edwards was eight. He was pinned in the debris with a dead classmate against his shoulder, unable to move, while the screams around him slowly stopped. At around 11am a fireman cut him free with a hatchet and he was passed out along a human chain. He was the tenth child rescued that morning and the last survivor pulled from the school. Nobody found after him was alive.
Decades later, he told ITV that because most of his class died, "our childhood was over that day at 9.15am."
The rescue itself was chaos. Miners came up from the colliery, parents dug with their bare hands and thousands of volunteers poured in from across the valleys, so many that they sometimes got in the way of the professionals. 29 children were taken to hospital, and eight of them had injuries expected to last the rest of their lives, a UK government case study of the disaster notes. The search for bodies went on for about a week.
Bethania Chapel and the Long Wait
The bodies were taken to Bethania Chapel, which became a makeshift mortuary. Volunteers washed the coal off the children so that parents could identify them, and Detective Inspector Charles Nunn helped organise the whole grim process. With no council offices nearby, death certificates were handed out from a local chip shop, Mental Floss reports. Bethania itself was later destroyed by an arsonist in 2015.
Some families had to wait days to find out for certain. Lord Snowdon, Princess Margaret's husband, heard the news on the radio and arrived by train at 2am with a shovel in his bag. He found there was nothing to dig, so he made tea and sat with the families instead. According to biographer Anne de Courcy, he helped one father coax his son's clenched fist open to find a prefect's badge, which was how the man identified his boy. Snowdon wrote to Margaret afterwards that it was "the most terrible thing I have ever seen".
Kenneth Hayes, the minister of Zion Baptist Chapel, lost his eldest son. Eighteen children from his Sunday school died. He worked for about 36 hours straight at the school and with bereaved families, then preached the following Sunday, the day after his son's body was found, to a congregation that included weeping journalists. His manse also became the office where a local solicitor took the statements later used against the Coal Board, the Baptist Union records.
"Buried Alive by the National Coal Board"
The grief turned into anger very quickly. Official causes of death were listed as things like suffocation and multiple injuries. At the inquests, one father, who'd lost his wife and two sons, refused to accept that wording and said his child had been "buried alive by the National Coal Board". That line has stuck to the disaster ever since.
On 27 October, 81 of the children were buried together in a mass funeral in the cemetery on the hillside above the village. Around 2,000 people came to say goodbye. Princess Margaret, meanwhile, appealed for toys for the children who'd survived, and so many arrived that the post office in Cardiff had to store them in four empty buildings.
Lord Robens and the Unknown Spring
Prime Minister Harold Wilson and Prince Philip both got to Aberfan within about a day, and Wilson set up a Tribunal of Inquiry. Lord Robens, the NCB's chairman, took a lot longer. He went ahead with being installed as Chancellor of the University of Surrey in Guildford and didn't turn up until roughly 36 hours after the slide. When he did, he blamed an unknown spring under the tip. The villagers knew perfectly well that spring had been there all along.
The tribunal was chaired by Lord Justice Edmund Davies, who'd grown up just a few miles away in Mountain Ash and had presided over the Great Train Robbery trial two years earlier, the Dictionary of Welsh Biography notes. It sat for 76 days, heard 136 witnesses and looked at 300 exhibits. The government gave the Aberfan Parents' and Residents' Association legal aid, which meant the families could hire a top barrister of their own.
For much of the hearing, the NCB blamed the weather and denied liability it had privately accepted, wasting weeks of the inquiry's time. The report came out on 3 August 1967 and it was brutal. It found the disaster was entirely the NCB's fault, that the Board had no tipping policy at all and that its engineers gave the men on the ground no guidance. It called the whole thing "a terrifying tale of bungling ineptitude by many men".
Robens offered to resign. The Minister of Power, Richard Marsh, said no. Historian Martin Johnes has since shown that Robens got an early look at the report and that his private office ran a media campaign to keep him in post. Ministers didn't like him, but they kept him anyway because they thought he was the only man who could run down the coal industry without a national strike.
Margaret Thatcher, then the Conservative spokesperson on power, pushed in Parliament for answers about the conduct of senior NCB officials and never got them. Plaid Cymru leader Gwynfor Evans argued that the government would've paid far more attention if the tips had been sitting above Hampstead or Eton. Nobody at the Coal Board was prosecuted, sacked or demoted.
Slurry on the Welsh Office Floor
Even after the report, the other tips stayed where they were, right above the surviving families. Officials insisted they weren't dangerous. Residents petitioned to have them removed and got nowhere, so a group of them filled bags with slurry, took them to the Welsh Office in Cardiff and emptied them in the reception, the People's Collection Wales archive records.
Welsh Secretary George Thomas eventually agreed the tips would go. The problem was who'd pay. The NCB refused. Martin Johnes' account of the political aftermath shows it even undermined a rival firm that offered to do the job for less than the Board's own estimate. Thomas was the lone voice in cabinet against making the village chip in, but he gave way and then leaned hard on the disaster fund to cover part of the bill.
Wilson himself doesn't come out of it well either. Less than eight days after the disaster, he visited a school in Cornwall and said he'd felt "almost a sense of resentment at these happy innocent children" compared with the children of Aberfan. When the trustees of Bethania Chapel asked for the NCB to pay to rebuild their chapel, Robens turned them down and the disaster fund paid for it instead.
The Fund That Was Raided
The public response was enormous. The Aberfan Disaster Fund raised around £1.75 million from roughly 90,000 donations. Football clubs played charity matches, a group of men pushed a car 19 miles from Coventry to Stratford and the Kray twins sent £100 each, the Showcase of Fundraising Innovation and Inspiration records.
What happened to that money is one of the ugliest parts of the story. The Charity Commission wanted the trustees to check that bereaved parents had been close to their children before paying them anything. The trustees refused to do it. Meanwhile, the Coal Board's own compensation started at a miserable £50 per bereaved family and only reached £500 by 1970.
Then, in August 1968, £150,000 was taken from the fund to pay for removing the remaining tips above the village, a job that should've been the NCB's responsibility all along. Iain McLean read the records once they were finally opened and wrote to the new Welsh Secretary, Ron Davies, in 1997 to argue the money had been bullied out of the fund. Davies paid the £150,000 back that July, with no interest. In 2007 the Welsh Assembly Government followed it up with £2 million in grants for the Aberfan Memorial Charity and the Aberfan Education Charity. A government record of the commemorations sets out the details.
The tips caused trouble even after they'd gone. When serious flooding hit Aberfan in October 1998, an independent inquiry found that spoil from the removed tips had made it worse.
The Queen's Biggest Regret
Prince Philip went to Aberfan first, in her place. The Queen held back, and her advisers later admitted they'd kept urging her to go without success, History.com reports. She finally arrived on 29 October, eight days later. She walked through the village, met bereaved families and had tea with councillor Jim Williams, who'd lost seven members of his family. A three-year-old called Karen Jones handed her a bouquet with a card that said it was from the remaining children of Aberfan.
She went back three more times: in 1973 to open the community centre, in 1997 to plant a tree in the Garden of Remembrance and in 2012 to open the new Ynysowen Community Primary School. The delay has been widely reported as the biggest regret of her reign. Jeff Edwards met her around a dozen times over the years, and when she died in 2022 he told ITV that "each time she visited, she brought the community together."
She didn't attend the 50th anniversary in 2016, though. Prince Charles went instead and read her message to the village. The story reached a whole new audience in 2019, when Netflix's The Crown gave it an entire episode.
Growing Up After Aberfan
The children who survived carried it for life. In an early study of 86 local children aged three to 14, more than 80% showed moderate to very severe psychological trauma. Lots of them were terrified of thunder, sirens, low-flying planes or simply being left alone.
A follow-up published 33 years after the disaster tracked 41 of the survivors. Nearly half (46%) had experienced post-traumatic stress disorder at some point and 29% still met the criteria for it, decades on. Plenty of families couldn't face living under the remaining tips and moved away altogether.
The Tips Are Still There
Aberfan did change the law. The Mines and Quarries (Tips) Act 1969 brought in proper rules for tip safety, and after the tribunal the NCB had to compile information on all its tips for the first time. Robens later chaired the committee whose report led to the Health and Safety at Work Act 1974, which is a strange footnote given everything above. The Merthyr Vale colliery itself closed in 1989.
But the waste didn't go anywhere. There are still more than 2,500 disused coal tips in Wales, mostly in the South Wales valleys. In February 2020, after Storms Ciara and Dennis, a tip at Tylorstown in the Rhondda slid and sent more than 60,000 tonnes of debris into the Rhondda Fach river. It was proof that the danger hadn't gone away. In July 2025 the Senedd voted 50 to 0 for a new law, creating the Disused Tips Authority for Wales to register and monitor every old tip in the country.
Aberfan at 60
Pantglas Junior School is gone. The Aberfan Memorial Garden now sits on the site, while the children lie in the hillside cemetery under a long row of white arches.
For the 50th anniversary, Karl Jenkins wrote Cantata Memoria, a choral work for the children of Aberfan, premiered at the Wales Millennium Centre with Bryn Terfel, Catrin Finch and Côr Caerdydd.
On the 60th anniversary itself, 21 October 2026, the village's annual memorial service was held in the cemetery at 9.15am, the exact moment the tip came down. The King, Queen and Prince of Wales visited too, stopping at the Memorial Garden and the village community centre.
The National Library of Wales has also made three new copies of the Aberfan Book of Remembrance, written out by calligrapher Tanja Bolenz and bound by the library's own conservators. They'll be kept under glass in the village, with a page turned every month to show the names and birth dates of the people who died. The library has also opened an online archive of the disaster with Glamorgan Archives.
If you're anywhere near Merthyr, Cyfarthfa Castle Museum is showing Chuck Rapoport's photographs from the days after the disaster until 1 November. It's one of a long run of anniversary events across the borough, from concerts to a heritage fire engine that was the first emergency vehicle to reach the scene in 1966.
Sixty years on, what still hurts most is how preventable all of it was. The tip had moved before. The springs were on the map. A memo about sliding tips had sat in a drawer since 1939. Somebody wrote the warning down in 1963. The people of Aberfan have spent six decades making sure nobody forgets that.
Aberfan wasn't the only wound of the 1960s that Wales still remembers. Today the famous Cofiwch Dryweryn wall near Llanrhystud also carries the words Cofiwch Aberfan, linking the disaster to the drowning of Capel Celyn to supply Liverpool with water.
Further Reading
If you want the full story of what went wrong and how the government handled it, Iain McLean and Martin Johnes' Aberfan: Government and Disasters is the book to get. McLean's digging through the archives is what helped get the £150,000 returned to the village. For the survivor's side of it, Gaynor Madgwick's own book about that day is well worth tracking down too.
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Sources
Iain McLean, Lessons from the Aberfan Disaster and Its Aftermath, British Academy Review
Martin Johnes, The Political Aftermath of the Aberfan Disaster
Dave Petley, The National Coal Board and Aberfan, The Landslide Blog (AGU)
The True Story of the Aberfan Disaster, Smithsonian Magazine
Man Calls for Recognition of Godmother Who Died Saving Pupils in Aberfan Tragedy, ITV News
Lord Snowdon Was the First Member of the Royal Family to Arrive at Aberfan, AOL
Remembering the Aberfan Disaster, Baptist Union of Great Britain
Edmund-Davies, Herbert Edmund, Dictionary of Welsh Biography
People of Aberfan Pay Tribute to Queen Elizabeth II, ITV News
Charles Delivers the Queen's Message to Aberfan Mourners, ITV News
The Aberfan Disaster: 33-Year Follow-Up of Survivors, British Journal of Psychiatry
Disused Mine and Quarry Tips (Wales) Act 2025, Explanatory Notes, legislation.gov.uk
Senedd Passes First-of-Its-Kind Disused Tips Bill, Cwmbran Life
Listen to Cantata Memoria, Karl Jenkins' Tribute to Aberfan, Classic FM
King, Queen and Prince of Wales to Visit Aberfan on 60th Anniversary, Nation.Cymru
New Aberfan Book of Remembrance Presented to Community, National Library of Wales
