Reporter Jordan Davies said a heat haze could be seen on the slopes of Pen y Fan on Wednesday afternoon with temperatures at 33C (91F).
Wales’ third highest mountain provides some of the toughest terrain in the UK, making it a proving ground for soldiers and elite civilian athletes.
The Fan Dance, as it is known in the military, forms the backbone of all British special forces selection, including the world-famous SAS.
Three SAS reservists died in a selection march there in July 2013.
Thirteen years later, walkers and others stopping at the Storey Arms car park have described the death at the weekend as “very sad”.
Zoe Morris, 31, and her mother have been running a Storey Arms burger van that sits at the bottom of Pen y Fan for the past 40 years.
She said they serve the hikers that walk up the mountain “every day except Christmas” including the participants of the Fan Dance.
“They usually do the same route.
We usually cater for them in the winter and the people that know us still come for some food,” she added.
Morris said she was not working on Saturday, but her mother noticed it was “quiet for a Saturday afternoon”.
“We didn’t hear anything from them after midday.
“So we thought something might have happened,” she said.
