Armistice was announced on September 8, 1943. Ambra was scuttled in La Spezia on September 9, 1943. Later refloated by the Germans she was again sunk in Genoa during an air raid by 144 B-17 Flying Fortresses of the 449th and 450th Group of the 15th Air Force on September 4, 1944. Notes References External links Sommergibili Marina Militare website Perla-class submarines World War II submarines of Italy Lost submarines of Italy Maritime incidents in September 1944 World War II shipwrecks in the Mediterranean Sea 1936 ships Ships built by OTO Melara Ships built in La Spezia Submarines sunk by aircraft Ships sunk by US aircraft