success. In the early afternoon of July 21, 1941 Diaspro under command of captain Antonio Dotta sailed from Cagliari to her area of operation about 55 miles off Cape Bougaroun. The next day she arrived at her station and began patrolling on the surface, submerging periodically to obtain a signal on the hydrophones. Finally, around 22:58, after seven hours of search and 45 miles of sailing she managed to close in on a British naval group. Diaspro closed in to within 1,000-1,300 meters and at 23:07 launched four bow torpedoes against cruisers, and two minutes later she fired two stern ones at a battleship and an air-carrier. Destroyer detected the first four torpedoes and warned other ships of danger, and the column made a starboard turn, avoiding torpedoes. Two stern torpedoes traveled harmlessly under the destroyer's hull, as they were set to run deeper to hit a larger ship. went on to launch depth charge attack against Diaspro, only causing minor damage to the submarine. Between the end of July and the beginning of August 1941, Diaspro was deployed to patrol an area southwest of Sardinia with three other submarines to intercept a British convoy, part of Operation "Style" but she did not sight any ships. She was then relocated to patrol off the island of La Galite. In September 1941, she was initially deployed off the island of La Galite. On September 28, she was deployed east of the Balearic Islands, southeast of Menorca as a screen against naval forces of British Operation Halberd however, British ships did not pass in those waters. She then received an order to move south, and in fact, at 6:17 on September 29, she sighted enemy ships about forty miles northwest of Philippeville in the position . Diaspro launched two torpedoes against destroyer , who however spotted torpedo wake, and maneuvered away from being hit. On October 20, 1941, on a mission off Cape Fer, she sighted ships of Force K but could not attack them due to being too far away. From April 1 to September 10, 1942 Diaspro was assigned to the Submarine School at Pula where she participated in 32 training missions before being reassigned to active duty at Cagliari. On November 8, 1942 Diaspro was involved in an underwater collision with another Italian submarine , near Cape Bougaroun, while approaching her patrol sector. suffered serious damage, while Diaspro had