French submarine Persée
"Persée" was part of a semi-homogenous class of thirty-one submarines designed for oceangoing patrols and entering service between 1931 and 1939. long and with a beam of and a draught of , their maximum diving depth was . Their displacement was 1,572 tonnes on the surface and 2,082 tonnes submerged. Surface propulsion was provided by two diesel motors with a total of , giving a maximum surface speed of , with electric propulsion of giving a submerged speed of . They had a surface range of at 10 knots and a submerged range of at . Laid down on 14 April 1929 with the hull number Q154, the submarine was launched on 23 May 1931. On 26 September 1932, two months after the loss of the , another incident killed six sailors and workers at the naval docks in Cherbourg. Commissioning under the command of lieutenant de vaisseau Bertrand, the "Persée" left for trials off pointe de Jardeheu, a few miles to the west of Cherbourg. The crankcases of the Schneider diesel motors leaked oil and then exploded, killing two men and wounding several others, including the vessel's second in command, "lieutenant de vaisseau" Jean L'Herminier, future commander of the during the Second World War. The submarine was towed back to Cherbourg by the "Simon-Duhamel II", a trawler operating from Fecamp, escorted by the submarine , whose doctor treated the wounded. The "Persée" then entered service on 10 June 1934. At the start of the Second World War she, , and formed the 6th submarine division, based at Brest. "Persée" and "Poncelet" patrolled off the Azores, whence part of the German merchant fleet had fled and from which they were suspected to be acting as supply ships for German U-boats. The pair of submarines returned to Cherbourg on 12 October. During the German advance in spring the next year she left Cherbourg for Brest, departing the latter at 18:30 on 18 June in tandem with the supply ship "Jules Verne", "Ajax", "Poncelet", "Casabianca", and nine other submarines, arriving at Casablanca on 23 June. After the British attack on Mers-el-Kébir on 3 July, she and "Ajax" patrolled along the Moroccan coast. From 19 July onwards "Poncelet" and "Persée" were instead based at Dakar. From 26 to 29 August "Persée" escorted the cable-laying ship "Alsace", which had been sent to repair the cable between Casablanca and Dakar, which the British had cut off Cap Juby. On 23 September Dakar was attacked by British and Free French forces. torpedoed the "Persée" on the surface off Cap Manuel but failed to sink her. However, British destroyers continued to hunt her and - unable to dive due to shoals - she was seriously damaged and set on fire. Her whole crew except one quartermaster was then picked up by the aviso "La Surprise".
History ; Second World War
Based at Brest at the onset of the Second World War, "Persée" joined in the search for the German merchant fleet still at sea. "Persée" was attacked at Dakar where the submarine was torpedoed on the surface by a British ship.