Odesa catacombs
Odesa Oblast, Ukraine
Nature
The Odesa catacombs are a labyrinth-like network of tunnels located under the city of Odesa and its outskirts in Ukraine, that are mostly the result of stone mining, particularly coquina. The system of Odesa Catacombs consists of a network of basements, bunkers, drainage tunnels and storm drains as well as natural caves.
From Wikipedia, CC BY-SA 4.0
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