Yeah, I've seen this one. This is an "alternative entrance" to a decently-sized cave with a normal access elsewhere off camera.

That's not to say there aren't examples of some truly disturbing spelunking - https://i.imgur.com/BkmpH9v.jpg

Oh man, that poor guy didn't make it:

https://www.deseretnews.com/article/705347362/Man-trapped-in...

I saw that picture and read up more on the story a while back... absolutely horrifying situation. Stuck upside down underground for hours, unable to move or escape even though there are others right behind you that you can communicate with until you eventually die. Somewhat unrelated, but that is part of what made me decide to not further pursue my cave diving certification

Damn that's frightening. They need semi-autonomous robots (spider-like?) to crawl ahead with a camera before going head-first into a place like that.

That image is simply terrifying.