re: #85 Wendell Zurkowitz ((slave to the waffle light))
I used to go spelunking at IU, we had a skinny fellow, George, who went ahead. If he could not fit, we did not try to follow.
I have only been in one cave, Cuevas del Drach on the island of Majorca.
They run a tour group of boats through the cave complex, and you are treated to a classical music concert in the caves. Not exactly natural, but safe for a chicken like me.