The cataphiles sometimes refer to the liquid in catacombs as secret swimming pools.
Under Paris, there is a network of tunnels known as the catacombs. The original use of these tunnels was to act as a mine for stones; however, nowadays they are not used.
These tunnels attract and the fact entrance is restricted has attracted some to illegally explore and even camp in the tunnels, they are known as the cataphiles.
The cataphiles have a lot of experience in the tunnels and they are aware in some zones especially after raining liquid flows through the walls and creates small ponds. This water collection is often referred to by them as swimming pools as some are so deep you can swim in them.
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