Beneath the sunlit streets of Athens's Kerameikos district lies a hidden, claustrophobic, and potentially deadly network of ancient water cisterns. In this episode, we explore the groundbreaking engineering of the ancient Greeks, who developed a specialized, hand-polished waterproof mortar that enabled them to build these underground vaults anywhere, independent of solid bedrock.

Because these narrow, flask-shaped chambers were built in unstable soil and are prone to flooding and fatal cave-ins, physically excavating them is incredibly dangerous. Tune in to discover how modern research teams have overcome these extreme hazards by combining limited modern GPS anchor points with meticulous 150-year-old handwritten excavation diaries to triangulate a "ghost map" of Athens' hidden underground world.

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