These ultra-high levels of carbon dioxide are caused by the same geological system that created the area"s hot springs and dramatic travertine terraces. Hierapolis is built on the Pamukkale fault, a 35km-long active tectonic fault zone where cracks in the Earth"s crust allow mineral-rich water and deadly gases to escape to the surface. One of them runs directly under the city centre and into the Ploutonion.

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