Derinkuyu was an entire city complex built in a hole beneath the surface in Turkey. It wasn’t just only an emergency housing or refuge shelter but a large city supplied with water, houses, church, shops, storage areas, living rooms, bedrooms and teaching schools. There were 13 different floors leading deep down, the lowest being at a depth of 290 ft. 52 deep ventilation shafts for the circulation of fresh air had been excavated. The entire complex was built using tools that exceeded the capabilities of the Turks of the period.
Derinkuyu
