Cold air should be pumped down to the miners. As much as possible, even though it won't be much.
Even if it is too little to cool an entire chamber much, or more than a few miners at one time, the temperature reference will provide them valuable sense-information for metabolism, activity rate and other matters of health.
They would have to spend only a few minutes on rotation at first to give all the miners an initial break from the heat.
It will be difficult because properly, it needs an insulated air flow, must be pumped fresh and very cold, and must be pumped rather rapidly to prevent its warming up on the long journey down through the hot rock.
All those variables will have to be worked out by engineers.
It's probably worth another hole.
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