Reporter Jordan Davies reported that temperatures of 33C (91F) could be seen on the slopes of Pen-y-Fan on Wednesday afternoon.
Wales’ third highest mountain offers some of the most challenging terrain in the UK, making it a testing ground for soldiers and elite civilian athletes.
The Fan Dance, as it is known in the army, forms the basis of the selection process for all British special forces, including the world famous SAS.
Three SAS reservists died there during a selection march in July 2013.
Thirteen years later, pedestrians and others staying in the Storey Arms car park have described the weekend’s death as “very sad”.
Zoe Morris, 31, and her mother have been running the Storey Arms burger van, which sits at the bottom of Pen y Fan, for the last 40 years.
She said they cater to tourists who climb the mountain “every day except Christmas,” including Fan Dance participants.
“They usually take the same route.
We usually serve them in the winter and people who know us still come for food,” she added.
Morris said she didn’t work Saturday, but her mother noted it was “quiet” for a Saturday afternoon.
“We didn’t hear anything from them after noon.
“So we thought something might have happened,” she said.