Imminent Heat Stroke in the Inferno

From Harknell, I have figures for heat and humidity in Snowdon pit back in the day (100˚F at the face (38C) humidity 80˚)

I wanted to know what these figure might mean in terms of health so-

Using this Humidex rating scrumped from the Canadian Occupational Health Resource to plotted Snowdon conditions on the graph (represented with a star). Results in a Humidex reading of 58- in the red ‘imminent heat stroke’ zone.

This graph doesn’t take account of the poor ventilation and amount of dust in ‘the Inferno’

So how did men fare under those conditions?

Mr McEwan quoted by Harknell: ‘ There was a fella tramped from Durham, took him seven days to get here, and he got his job on the Monday night, he sat down at 2-o-clock and said” I do feel bad”, and the next thing he just keeled over-dead as doornails’

Others got out in time:

‘The heat was so tremendous that he couldn’t stick it. He came, signed on, so pleased he’d got a job and then- he disappeared.’

And some that were flagging were pushed out in time:

‘Some of them couldn’t work, they were too weak. They were in such bad stress after walking down. They eventually got the sack, they’d have a note on their lamp and they’d have to see the manager. He’d stand them off and then they’d walk back. It was terrible. They didn’t have much help of us either. It was dog eat dog. You didn’t have the money.’

You had to be under forty, in good health, and to have worked recently to have a chance at Snowdon- The point is Snowdon conditions were just at the limit of human tolerance-