Thanks! I'm glad to know that it's not a reference I'm familiar with and totally missed.
Just read a summary and review. Sounds terrifyingly good!
There's a cave trail up near Collingwood in Ontario, Canada where it narrows so much I was deathly afraid of getting stuck. This is how I would imagine it.
This is a pic of one part I found.
I hated it.
There was this documentary on youtube called cave exploring gone wrong marathon. It was an hour long and a fantastic watch. Nothing ever gave me more anxiety then that. I tried to find it but it's now private. There is no way i'll ever go down a cave ever.
https://vt.co/news/us/john-edward-jones-nutty-putty-cave-final-words-revealed Dude died stuck upside down in a cave. Since you gave me flashbacks, I give you this.