The underground city at Derinkuyu could be closed from the inside with large stone doors. The complex has a total 11 floors, though many floors have not been excavated. Each floor could be closed off separately.
The city could accommodate between 35,000 and 50,000 people and had all the usual amenities found in other underground complexes across Cappadocia, such as wine and oil presses, stables, cellars, storage rooms, refectories, and chapels. Unique to the Derinkuyu complex and located on the second floor is a spacious room with a barrel vaulted ceiling. It has been reported that this room was used as a religious school and the rooms to the left were studies[1].
Between the third and fourth levels is a vertical staircase. This passage way leads to a cruciform church on the lowest level.
The large 55 m ventilation shaft appears to have been used as a well. The shaft also provided water to both the villagers above and, if the outside world was not accessible, to those in hiding.

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One of the heavy stone doors. They have a height of 1–1,5 m, 30–50 cm in width and weigh 200–500 kg. The hole in the centre can be used to open or close the millstone, or to see who is outside[3].

Kaymaklı Underground City


Kaymaklı Underground City is contained within the citadel of Kaymaklı in the Central Anatolia Region of Turkey. First opened to tourists in 1964, the village is about 19km from Nevşehir, on the Nevşehir-Niğde road. The ancient name was Enegup. The houses in the village are constructed around the nearly one hundred tunnels of the underground city. The tunnels are still used today as storage areas, stables, and cellars. The underground city at Kaymaklı differs from Derinkuyu in terms of its structure and layout. The tunnels are lower, narrower, and more steeply inclined. Of the four floors open to tourists, each space is organized around ventilation shafts. This makes the design of each room or open space dependent on the availability of ventilation.
A stable is located on the first floor. The small size of the stable could indicate that other stables exist in the sections not yet opened. To the left of the stable is a passage with a millstone door. The door leads into a church. To the right of the stables are rooms, possibly living spaces.
Located on the second floor is a church with a nave and two apses. Located in front of the apses is a baptismal font, and on the sides along the walls are seating platforms. Names of people contained in graves here coincide with those located next to the church, which supports the idea that these graves belonged to religious people. The church level also contains some living spaces.
The third floor contains the most important areas of the underground compound: storage places, wine or oil presses, and kitchens. The level also contains a remarkable block of andesite with relief textures. Recently it was shown that this stone was used as a pot to melt copper[1]. The stone was hewn from an andesite layer within the complex. In order for it to be used in metallurgy, fifty-seven holes were carved into the stone. The technique was to put copper ore into each of the holes (about 10cm in diameter) and then to hammer the ore into place. The copper was probably mined between Aksaray and Nevsehir. This mine was also used by Asilikhoyuk, the oldest settlement within the Cappadocia Region.
The high number of storage rooms and areas for earthenware jars on the fourth floor indicates some economic stability. Kaymaklı is one of the largest underground settlements in the region. The large area reserved for storage in such a limited area appears to indicate the need to support a large population underground. Currently only a fraction of the complex is open to the public.






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http://en.wikipedia.org/wiki/Kaymakl...derground_City

Özkonak Underground City


Özkonak Underground City is an ancient city built on the northern slopes of Mt. Idis about 14 km northeast of Avanos in Turkey. The city has many strata made up of volcanic granite its larger areas are connected to each other by tunnels. Özkonak had a built in communication system of pipes to each of its levels, unlike Kaymaklı and Derinkuyu which have no such communication systems. Each carved out room had ventilation provided by holes when the city was closed against enemies.
Özkonak Underground City was discovered in 1972 by a local farmer named Latif Acar, who was curious about where his excess crop water was disappearing to. Latif discovered an underground room which, when later excavated, revealed a whole city which could house 60,000 people for up to three months. Although only four floors are now open, the complex contains a total of ten floors, to a depth of 40m.
Unlike the other underground cities in this area, there were holes above the tunnels used for dumping hot oil on the enemy. Just like Kaymaklı and Derinkuyu, Özkonak has a water well, ventilation system, winery and moving stone doors.






A panorama of Özkonak


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