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In page Catacombs of Paris:

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Mine consolidations were still occurring and the underground around the site of the 1777 collapse[2] that had initiated the project had already become a series of stone and masonry inspection passageways that reinforced the streets above. The mine renovation and cemetery closures were both issues within the jurisdiction of the Police Prefect Police Lieutenant-General Alexandre Lenoir, who had been directly involved in the creation of a mine inspection service. Lenoir endorsed the idea of moving Parisian dead to the subterranean passageways that were renovated during 1782.[citation needed] After deciding to further renovate the "Tombe-Issoire" passageways for their future role as an underground sepulchre, the idea became law in late 1785.[citation needed]