Cappadocian safe bolt hole

This is the underground safe house created in Cappadocia. Was it designed in fear of cosmic catastrophism – or was it designed as a safe place for the locals when predatory armies were rampaging through the region. Go to http://news.nationalgeographic.com/2015/03/150325-underground-city-cappa… …. where it is inferred local Christians hid there from various Islamic intrusions into the region, from the Seljuk Turks to the Ottomans. However, the origin of the underground town may be far older – so there may be more to this story than initially meets the eye.