Hey spectrumecons! I'm glad you've taken an interest in the underground cities, even before me posting about them. I was really confused when I first entered because I was expecting like an underground Atlantis, I couldn't be more wrong.. everything was indeed really small and tight, the passages are so small that even I found it difficult to navigate sometimes! I hope you get to visit one someday, I'd be interested to hear what you thought about them after visiting.