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In page Catacombs of Paris:

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The undermined state of the Left Bank was known to architects as early 17th-century construction of the Val-de-Grâce hospital (most of its building expenses were due to its foundations), but a series of mine cave-ins beginning 1774 with the collapse of a house along the "rue d'Enfer" (near today's crossing of the Avenue Denfert-Rochereau and the boulevard Saint-Michel) caused King Louis XVI to name a commission to investigate the state of the Parisian underground. This resulted in the creation of the inspection Générale des Carrières (Inspection of Mines) service.[citation needed]