Bill Richards was at the scene of the Cambrian mining disaster in Clydach Vale in 1965, in which 31 miners were killed.
Here, he talks to ITV News about his memories of the disaster.
More top news
The world record attempt will raise money for the foundation set up in memory of the Olympic gold medallist, who died in May 2013.
In today's Newsweek, Carl talks about what the 'No' vote in the Scottish Referendum could mean for Wales and the impact of legal highs.
England manager talent spotting at Swansea City v Southampton at the Liberty Stadium