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>Fact 1 : It's illegal to go inside the quarries beneath Paris since the law from 2 november 1955
"Art.1. It is forbidden for any person who does not have an authorization from the General Inspection of Quarries to open the doors and hatches to access stairs and stepped wells or other old quarries, to descend, enter and to circulate in the voids of the old quarries extending under the influence of the public roads of the City of Paris."