In Paris the word "catacombs" is used in a larger sense than ossuaries. It also covers the huge network of old quarries, mostly on the left bank. They pretty po

In Paris the word "catacombs" is used in a larger sense than ossuaries. It also covers the huge network of old quarries, mostly on the left bank. They pretty popular with urban explorers ("cataphiles"). The data center is built in one of these quarries turned into a shelter.