WHAT THE FUCK IS THIS SHIT? HOW MANY OF THEM ARE OUT THERE?
Derinkuyu underground city
The Derinkuyu underground city (Cappadocian Greek: Μαλακοπή Malakopi) is an ancient multi-level underground city in the Derinkuyu district in Nevşehir Province, Turkey, extending to a depth of approximately 60 metres (200 ft). It is large enough to have sheltered as many as 20,000 people together with their livestock and food stores.
https://en.wikipedia.org/wiki/Derinkuyu_underground_city