cataphile
A type of urban explorer who visits the ancient catacombs and quarries linked by tunnels beneath Paris, France.
Philip, who uses only his first name, said: "This world is divided into two races, the tourists and the cataphiles. The tourists are a hated race. … You have to do everything to chase them out." […] "There have always been cataphiles, but perhaps in the past they were more respectful," [Michel] Laroche said. "It is not a sacred place, but it is our patrimony."
An individual who explores subterranean catacombs, mines, or quarries.
Urban exploration has many subcultures, each with its own fetishes and slang. There are rooftoppers, builderers, cataphiles and those with a taste for "ruin porn" – artfully lit photos of decaying masonry and Rorschach water stains.
Where it comes from
Borrowed from French cataphile, a blend of catacombe (“catacomb”) + -phile (suffix denoting one who loves a thing).
Adapted from the Wiktionary entry cataphile (CC BY-SA 4.0).