Before revision: Cataphiles are urban explorers who illegally tour the Mines of Paris, a term popularly used to describe a series of underground tunnels that were built as a network of stone mines, which are no longer used.
After revision: Cataphiles are urban explorers who illegally tour the Mines of Paris, a term popularly used to describe a series of tunnels that were built as a network of stone mines, which are no longer used.