Christian heritage under the ground waits to be explored
Ali Yamaş and Bülent Erdem are engaged in caving. They have a cave research group called “Obruk” (sink-hole). We wanted to talk to two experienced cavers about the works in this field. However, we found ourselves talking about the underground cities in Turkey. They say that there are many underground cities that were built by Christian peoples especially between 6th and 11th centuries.
