In person those tunnels are quite claustrophobic. You have to bend over quite a bit and at the same time you're thinking that there's thousands of tons of rock

In person those tunnels are quite claustrophobic. You have to bend over quite a bit and at the same time you're thinking that there's thousands of tons of rock above you. Quite a few people in my tour group turned back because they couldn't handle it. Visited in 1995.