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Miners searching for their children in the slag heap that slipped down the mountainside to engulf their village school, Aberfan. (Photo by Michael Ward/Getty Images)

Miners searching for their children in the slag heap that slipped down the mountainside to engulf their village school, Aberfan. (Photo by Michael Ward/Getty Images)

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Rescue workers at the scene of the wrecked Pantglas Junior School at Aberfan, South Wales, where a coal tip collapsed killing over 190 children and their teachers. (Photo by Keystone/Getty Images)

Rescue workers at the scene of the wrecked Pantglas Junior School at Aberfan, South Wales, where a coal tip collapsed killing over 190 children and their teachers.   (Photo by Keystone/Getty Images)

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People, Disasters, Industry, (Coal Mining), Aberfan, South Wales, pic:circa 22nd October 1966, A scene of devastation at Aberfan after the landslide which had destroyed the school and houses, On the 21st October 1966 coal waste from the mountain above Aberfan crashed down on Aberfan, engulfing the school and some houses in the village, killing 116 children and 5 teachers at the school and some residents close by (Photo by Bentley Archive/Popperfoto via Getty Images/Getty Images)

People, Disasters, Industry, (Coal Mining), Aberfan, South Wales, pic:circa 22nd October 1966, A scene of devastation at Aberfan after the landslide which had destroyed the school and houses, On the 21st October 1966 coal waste from the mountain above Aberfan crashed down on Aberfan, engulfing the school and some houses in the village, killing 116 children and 5 teachers at the school and some residents close by  (Photo by Bentley Archive/Popperfoto via Getty Images/Getty Images)

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People, Disasters, Industry, (Coal Mining), Aberfan, South Wales, pic: 27th October 1966, Sad scenes at the graveside tell the story of people (many schoolchildren) who died when the coal tip fell on Aberfan, On the 21st October 1966 coal waste from the mountain above Aberfan crashed down on Aberfan, engulfing the school and some houses in the village, killing 116 children and 5 teachers at the school and some residents close by (Photo by Bentley Archive/Popperfoto via Getty Images/Getty Images)

People, Disasters, Industry, (Coal Mining), Aberfan, South Wales, pic: 27th October 1966, Sad scenes at the graveside tell the story of people (many schoolchildren) who died when the coal tip fell on Aberfan, On the 21st October 1966 coal waste from the mountain above Aberfan crashed down on Aberfan, engulfing the school and some houses in the village, killing 116 children and 5 teachers at the school and some residents close by  (Photo by Bentley Archive/Popperfoto via Getty Images/Getty Images)

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Aberfan, Wales, 28th October, 1966, A line of coffins of 82 victims of the Aberfan disaster lie in their grave on the hillside following the funeral service held for the people that died in the landslide (Photo by Bentley Archive/Popperfoto via Getty Images/Getty Images)

Aberfan, Wales, 28th October, 1966, A line of coffins of 82 victims of the Aberfan disaster lie in their grave on the hillside following the funeral service held for the people that died in the landslide  (Photo by Bentley Archive/Popperfoto via Getty Images/Getty Images)