That sounds like an adventure!! 45 minutes and changing temperatures my gosh!!!
all we had was hot and humid all throughout glad I was wearing shorts and a shirt.
Unfortunately we had some of our classmates who died young. One even died when we were in college and was a very sad affair.
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So, there would be places where air shafts had opened from the surface and so it was coming into the cave. I don't know how big they were, I couldn't see them really, but you could definitely feel the breeze when you walked through it and the difference in temperature.
These were more of a series of caves that had basically been worn down into one. Large, mostly open spaces. It would almost be like how you would build a home. In fact, we were told that there was at least one group of the mayans that stayed in the cave during some conflict. I would think it would get kind of gloomy and people would go stir crazy after a while. You would need to be coming up to the surface and getting some food and getting some sunlight, too, just to feel human.
re: died young
Yeah, that would be very sad. Are we talking illnesses, accidents, overdoses, gunfights?