I didn’t like how the guide seemed to rush us. You couldn’t lag behind because while one person was turning the lights on ahead of the group another was turning them off behind us. I couldn’t get any good photos.
You could choose different tours. I forget which one we chose, but I HATED the entrance. It was soaking wet stairs with a cold, wet and slick metal handrail. The stupid stairs felt almost vertical and there was a pit (or something like it) fairly close the bottom
Very, very bad when you have a fear of heights. Other than that I loved it.