21 October 1966 Aberfan Disaster
It took just five minutes for the coal tip above Aberfan to slide down the mountain and engulf a farm, several houses and a school. Pupils at Pantglas Junior School were just beginning their first lessons of the day when the rushing landslide of mud and debris flooded into their classrooms.
Some children were able to escape, but 116 were killed. Another 28 adults also died.