Italian submarine Comandante Cappellini

Italian submarine Comandante Cappellini was a World War II Italian Marcello-class submarine built for the Italian Royal Navy (Regia Marina). After Italy's surrender, the submarine was captured by the Japanese and handed over to Germany as UIT-24. Following the capitulation of Germany, the Japanese integrated the boat into their fleet as I-503 (伊号第五百三潜水艦). Following the end of the war, the United States scuttled the submarine in 1946.

Service history
Operating under the command of Capitano di corvetta Cristiano Masi, later Capitano di corvetta Salvatore Todaro, then of Tenente di vascello Aldo Lenzi, later of Tenente di vascello Marco Revedin and Capitano di corvetta Walter Auconi, Comandante Cappellini carried out several war patrols in the Atlantic Ocean while based in BETASOM, sinking 31,648 gross registered ton of enemy shipping. She participated in the rescue of the survivors of the RMS Laconia (1921) in September 1942. Was later converted to the transport of strategic materials to and from Japan. After Italy's capitulation in 1943, the submarine was captured by the Imperial Japanese Navy and handed over to Germany at Sabang on 10 September 1943. Commissioned into the Kriegsmarine as foreign U-boat UIT-24 and assigned to 12th U-boat Flotilla with a mixed Italian and German crew. She remained in the Pacific because of failed attempts to return to the 12th Flotilla base at Bordeaux in occupied France.

At Germany's surrender in May 1945, the submarine was taken over and commissioned into the Imperial Japanese Navy as I-503 (her crew now a mixture of Italians, Germans, and Japanese) and shuttled between ports as a transport submarine. At Japan's surrender in August 1945, she was seized by the United States Navy, which scuttled her off Kobe on 16 April 1946.

In fiction
Cappellini is mentioned (and seen briefly in some scenes) in the 2011 TV movie The Sinking of the Laconia. The "Capellini" and her crew are the main subject of a Japanese two hour TV 2022 special "Sensuikan Cappellini-go no Boken" (The adventure of the Submarine Cappellini). The vessel plays a central part in the upcoming 2023 Italian war film Comandante.