Italian submarine Giovanni da Procida
Giovanni Da Procida was one of four s built for the (Royal Italian Navy) during the 1920s. She played a minor role in the Spanish Civil War of 1936–1939 supporting the Spanish Nationalists. Design and description. The "Mameli" class was one of the 's first classes of submarines to be built after the First World War. They displaced surfaced and submerged. The submarines were long, had a beam of and a draft of . They had an operational diving depth of . Their crew numbered 49 officers and enlisted men. For surface running, the boats were powered  by two diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a electric motor. They could reach on the surface and underwater. On the surface, the "Mameli" class had a range of at ; submerged, they had a range of at . The boats were armed with six torpedo tubes, four in the bow and two in the stern for which they carried a total of 10 torpedoes. They were also armed with a single deck gun forward of the conning tower for combat on the surface. Their anti-aircraft armament consisted of two single machine guns . Construction and career. "Giovanni Da Procida" was laid down by Cantieri navali Tosi di Taranto at their Taranto shipyard in 1925, launched on 1 April 1928 and completed in 1929. During the Spanish Civil War, the submarine unsuccessfully attacked a ship in the Aegean Sea during a patrol on 24 August–4 September 1937.