Depends on how deep down the spider is I would think. I think the soil insulates the spider, protecting it from the intense heat, and I doubt oxygen is a problem.
It's a bit late to think logically so will formulate a proper response in the morning
"We choose to do these things, not because they are easy, but because they are hard" - John F. Kennedy
Fidentia est ultimum potentiae
Vigilo
Confido