while doing some research on space and ceiling heights I got curious about the language of cave heights and stumbled across a number of links to Panoramic Cave tours on wikipedia.
A dozen goo panoramic cave right here: https://en.wikipedia.org/wiki/Caving
Describing such places or mapping them in a useful fashion for a RPG caving adventure would be a challenge. While caves have come up over the year in various publications it is curious how little time and language we commonly use that would apply to describing or navigating such a place.
Go check out those panoramic tours.