is there a genre or subgenre or whatever name for fiction about going into a giant hole that contains some kind of deeper truths in it yet? it seems like something that should have a name

what's up, gull and such here, recent "wait there's more than one of us" realizers. whoops!
still giant robot fans, still pmd: explorers enthusiasts. imagine we are wearing a big button that says "ask us about Void Stranger". you should play all the games we like right now. the media backlog continues to grow ever further, and finally fucking continuing Initial D slips further and further out of reach.....
is there a genre or subgenre or whatever name for fiction about going into a giant hole that contains some kind of deeper truths in it yet? it seems like something that should have a name
i just started calling them "Mystery Dungeon" stories in honor of my closest/favorite example in the medium.
This is basically a magical initiation? People do this in real life, the masons, some wicca, that kind of thing.