Derinkuyu: The Underground City Found Behind a Basement Wall

• Ö. Aydan & R. Ulusay, "Geomechanical Evaluation of Derinkuyu Antique Underground City…", Rock Mechanics and Rock Engineering (2013): https://link.springer.com/article/10.1007/... Depth figures (~40 m vs ~85 m) and floor counts vary with how shafts are measured; capacity (~20,000) is a widely repeated estimate. Early Phrygian origins are debated. Quotes and numbers are phrased cautiously where sources disagree. AI DISCLOSURE: The narration voice is AI-generated (Kokoro text-to-speech). The illustrations are AI-generated reconstructions for illustration only; they are not photographs or real artefacts. The script was researched and fact-checked against the sources above. Music: "Dark Ambient Cave Experience" by techtheist (CC0 1.0, Free Music Archive). Next episode: Karahan Tepe, Göbekli Tepe's darker sister. Subscribe to Stone Before Kings so you don't miss it. #Derinkuyu #Cappadocia #UndergroundCity #AncientHistory #HistoryDocumentary