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My mate did Badwater years back - had to go full beekeeper in the heat of the day - his team would try to spray water on him but it evaporated into steam before reaching his face. Fucked his guts up majorly - runners are constantly off into the scrub with the shits, but there's nowhere to shelter. After the race, he was sitting on top of 6 towels in the van and the blood pouring out of his arse still stained the seats.
https://www.theguardian.com/us-news/2021/jul/23/death-valley-ultramarathon-drought-heat