Why would a civilization create an underground city?

Why would a civilization create an underground city? In 1963, a Turkish homeowner accidentally discovered Derinkuya, an 8th-century BC underground city designed to house thousands of people. This underground wonder had advanced ventilation systems, schools and wineries strategically hidden below the surface of the earth. They managed the water through deep wells. Safety was paramount. A massive stone gate could have closed the city from invaders. The design of the city reflects a sophisticated society capable of organizing complex community life, including health care. Historical records suggest that Derinkuyu had areas dedicated to medical care, indicating the presence of doctors and healers within its walls. However, questions remain, such as why its inhabitants left this underground refuge. Some theories suggest environmental changes, security threats, or the integration of these communities into surface societies as potential reasons. This still leaves us wondering.#civilization#undergroundcity