Count Fortress out.
I mean, the folks who do this activity are gutsy, but in my opinion, also kinda nuts. Millions of tonnes of rock ain’t gonna cooperate if you find yourself in a pinch. And help won’t likely be much of any.
I love that horror flick The Descent (own it). I find it “horrific” not because of the monsters, but because of the cave-exploring shenanigans.
Being physically stuck, absolutely, is terrifying to me. And like I say, that rock ain’t giving a kunt hair. Ever.