In September 1944, Lieutenant Aldo Icardi, with the collaboration of the American Office of Strategic Services, parachuted behind the enemy lines of Mount Mottarone in command of Chrysler Mission with the specific task of capturing Benito Mussolini alive, and giving him to the Allied command. Icardi was in Busto Arsizio when Marnate's Bunker was built. He gathered information about it, and his reports are available in American archives, through which it has been possible to rebuild the history of the structure.