On June 14 1940 Paris Falls Under German Occupation Two Doctors Jean Talairach And Rene Suttel Discover An Entrance To The Mines Of The City They Start A Mapping Operation Of The Catacombs In Order To Help The Resistance And De Gaulle Risking Their Lives They Returned Night After Night Brushing Against Enemy Bunkers The Two Anonymous Heroes Mapped Out Over 300 Kilometers Of Galleries Thanks To Them Leaders Of The Resistance Were Able To Establish An Underground Headquarters Under Place Denfertrochereau In The Heart Of Paris Follow The Underground Odyssey Of Two Ordinary Men