An underground city and cistern belonging to Byzantine period were found in Talas. 1300-year-old underground city from the Byzantine period ... Translation from a French source contains the following information about the underground city and cistern: “The main entrance of the underground city is on the road. After a narrow entrance, there is a spacious room. In the main tunnel of the site, the passage is divided into two branches.”
Curved bends are reached at the main entrance of the city. “Tol” was used in construction and on the basis. The main tunnel continues with a left pass, and at the end there is a room of 20 x 5 meters in size. The spacious room at the entrance provides communication to the other rooms. A short tunnel on the right leads to the worship rooms.