"He saw what he described as a big wave of muck, higher than a house, coming over the railway embankment and heading straight towards him."
ITV News Correspondent Rupert Evelyn recalls the harrowing testimony of a young witness of the Aberfan disaster.
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Philip Thomas doesn't like to dwell on the disaster that buried him alive - but he can still recall in detail how an unpaid debt saved him.
Eleven when she lost her younger sister in the Aberfan disaster, Denise Morgan recalls a time of confusion, guilt and "unbelievable grief".
Wales has fallen silent to mark the 50th anniversary of the Aberfan disaster, which cost the lives of 116 schoolchildren.