Howell Williams smashed the glass above the classroom door and helped children from his class escape.
Jonathan Williams, who now lives in Radyr, Cardiff, said: "I think it changed him, I think he was a different man after 25 to how he was before.
In the BBC programme Surviving Aberfan, survivor Bernard Thomas recounted how his life was saved by Mr Williams."I looked around and I saw my teacher and I thought 'I'll get across to Mr Williams now' and he helped me out through the small panes of glass at the top of the classroom door."
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