Sirène-class submarine (1925) should not be confused with Sirène-class submarine (1901).
The Sirène-class submarines were a sub-class of the 600 Series built for the French Navy prior to World War II. There were four vessels in the class, built to a Loire-Simonot design. They were ordered in 1925 and completed by 1927.[1] [2] Three of the four boats of the Sirène class saw action during the Second World War, from September 1939 until the French armistice in June 1940.
The Sirènes had a displacement of 609LT surfaced and 757LT submerged. They had an endurance of 3500nmi at 7.5kn, with a maximum surface speed of, and a submerged speed of . Their armament was seven torpedo tubes (3 forward, 2 midships, and 2 aft) with an outfit of 13 torpedoes. As with all French submarines of this period, the midships torpedo tubes were fitted externally in trainable mounts. They had a single 750NaN0 and two 8 mm machine guns, and were manned by crews of 41 men.