During World War II, the quarries were one of three major undergroundV-1 flying bomb storage depots. In addition to the quarries, the facility includedblockhouses,bunkers,flak emplacements and railway links. Allied intelligence firmly identified late in June 1944 that Saint-Leu-d'Esserent andNucourt wereV-1 storage depots.[5] On 27 June 1944, Saint-Leu-d'Esserent was initially bombed by the USArmy Air Force,[6][7] then on 4/5 July 1944 by two RAF forces (the first unsuccessfully usedTallboy bombs in an attempt to collapse the limestone roof of the quarries).[5][8] Finally on 7 July 1944, an evening RAF raid successfully blocked the tunnels.[9]
^"Répertoire national des élus: les maires" (in French). data.gouv.fr, Plateforme ouverte des données publiques françaises. 13 September 2022.Archived from the original on 18 July 2021. Retrieved8 March 2021.