yep!! I recently went to a presentation about the cave explorations up on top of the mountains in the Bob Marshall Wilderness... they were entering a very tiny hole in the ground up on top of a mountain ridge that opened into a large complex of caverns underneath the mountain.... it was really amazing to think of how someone found this to begin with!!
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Absolutely! I saw one here in the UK a while back where they were crawling through some caves and had to crawl under a huge sheet of rock that was so unstable they couldn't touch it. They were following what felt like fresh air but if they didn't find a way out they wouldn't have been able to turn around! My heart was racing just watching it!!