Turquoise was one of six s built for the French Navy () in the first decade of the 20th century. During the First World War, she was captured by the Ottoman forces in late 1915 and served with the Ottoman Navy until 1918.
Design and description The Émeraude class were built as part of the French Navy's 1903 building program to a Maugas single-hull design.Gardiner & Gray, p. 208 The submarines displaced surfaced and submerged. They had an overall length of , a beam of , and a draft of . They had an operational diving depth of . Their crew numbered 2 officers and 23 enlisted men.Garier 1998, pp. 12–13, 23
For surface running, the boats were powered by two Sautter-Harlé diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a 300-metric-horsepower electric motor. They could reach a maximum speed of on the surface and underwater. The Émeraude class had a surface endurance of at and a submerged endurance of at .Garier 1998, p. 18
The boats were armed with four internal torpedo tubes, two in the bow and two in the stern, for which they carried six torpedoes.Garier 1998, pp. 18–19 Turquoise and her sister were the first French submarines to be equipped with a deck gun when they were fitted with a single gun in August 1915.
Construction and career Turquoise was laid down in October 1903Couhat, p. 138 at the Arsenal de Toulon, launched on 3 August 1908 and commissioned on 10 December 1910.Garier 1998, p. 12
During World War I, Turquoise received a direct hit to her periscope in the Dardanelles off Nagara Point, Ottoman Empire, on 30 October 1915 by an artillery corporal named Müstecip while traveling on the surface. The crew was forced to surrender. She was repaired by Ottoman forces on 3 November 1915 and taken into the Ottoman Navy as Müstecip Onbaşı, and returned in 1918.
Citations
Bibliography
External links Müstecip Onbaşı, in Turkey in the First World War web site.