If you are not sure if you have any problems with claustrophobia, try this one. Thereafter you will know for sure.
If you have claustrophobia, just a little bit, don't try, You will die.
It's, depending of the distance you choose. half an hour crawling through a wormhole or moleshole. You have to leave your backpack behind: you won't fit through the holes with it on you back. When you are finished you are dirty, but, one small lightpoint: they give you a yellow T-shirt.
You have to pass several deep holes going down and some corners are so narrow, you have to go on you side edge. The only light you have is a headlamp. But there is one consolation: you have a guide to guide and help you. You need one. When you got lost, nobody would find you back. There are stories ......