Yes Theory. Why Does This Ancient 20,000 person Underground City Exist? (Derinkuyu) Posted: May 30, 2025 | Last updated: May 30, 2025. Beneath the surface of Turkey lies Derinkuyu, an ancient ...

Beneath the surface of central Turkey lies Derinkuyu, an underground city that could house more than 20,000 people—entirely hidden until the 1960s. Built into volcanic tuff, the city extends ...

The Derinkuyu underground city is a sort of gargantuan anthill, except made by and for humans—up to 20,000 of them at a time, in fact. The city descends 280 feet into the earth, divided into ...

Located in modern-day Turkey, the ancient underground city Derinkuyu spanned seven levels, with four main ventilation channels and over 50,000 other smaller shafts. Researcher Sezin Nas re-created ...