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Discovery of Derinkuyu Underground City
In 1963, during a home renovation in the Derinkuyu District of Cappadocia, central Turkey, a local man discovered a hidden underground room after breaking through his basement wall. Further exploration revealed a network of tunnels and chambers. The authorities were notified, leading to the uncovering of a subterranean city descending over 85 meters (278.87 feet) into the Earth. This city, named Derinkuyu, spanned 18 levels and could house up to 20,000 people.
The city included dwellings, meeting halls, schools, temples, stables, wineries, and cellars. A well reaching 55 meters (180.45 feet) provided fresh water, while thousands of ventilation shafts ensured air circulation. Heavy stone doors, weighing approximately 500 kilograms, could seal each level to protect against invaders.
Theories About the Builders
The origins of Derinkuyu remain unclear. Some theories suggest it was built by the Hittites around 1200 BCE, while others attribute it to the Phrygians during the 8th and 7th centuries BCE. The volcanic rock from which the city was carved cannot be carbon-dated, leaving its true age uncertain. This has led to speculation that Derinkuyu could be much older than previously thought.
Discovery of Nearby Underground Cities
In 1964, another underground city was discovered in Kaymakli, just 8 kilometers (4.97 miles) from Derinkuyu. This city, connected to Derinkuyu by a tunnel network spanning 8 kilometers (4.97 miles), featured over 100 tunnels, housing areas, storage rooms, wineries, stables, and a burial chamber.
In 1972, the underground city of Özkonak was found. It included unique communication systems and defensive measures such as holes above entrances designed to pour hot oil on intruders.
Later Discoveries
In 2012, workers in Nevşehir uncovered an even larger underground city during urban development. This complex extended over 465,000 square meters and reached a depth of more than 112 meters (367 feet), surpassing Derinkuyu in size by approximately 30%. In 2020, another massive underground city was found in Midyat, potentially three times larger than Derinkuyu.
Potential Connections to Göbekli Tepe
Göbekli Tepe, an archaeological site in southeastern Turkey, features megalithic structures dating back to approximately 9,600 BCE. Some researchers propose a connection between Göbekli Tepe and Cappadocia’s underground cities. The intricate carvings and advanced construction at Göbekli Tepe suggest a sophisticated civilization, potentially linked to the builders of the underground cities.
Hypotheses and Legends
One theory posits that the underground cities were built as shelters during cataclysmic events such as the Younger Dryas period, a time of global cooling around 10,950 BCE. Ancient Zoroastrian texts, such as the Vendidad, describe an underground refuge built by Yima to survive a devastating winter. These stories may reflect historical events that inspired the construction of underground shelters.
Unanswered Questions
The true purpose and builders of the underground cities remain a mystery. The extent of the subterranean networks across Cappadocia and their possible connections to other regions challenge current understanding of ancient engineering and social organization.
Could more underground cities exist beyond Turkey’s borders? Were these cities part of a larger, coordinated effort to survive ancient disasters? Future archaeological discoveries and advanced technologies may provide answers to these enduring questions.

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