Émeraude-class submarine (1906) should not be confused with Émeraude-class submarine (1937).
The Émeraude class were built as part of the French Navy's 1903 building program to a Maugas single-hull design. The submarines displaced 395sp=usNaNsp=us surfaced and 427t submerged. They had an overall length of 44.9m (147.3feet), a beam of 3.9m (12.8feet), and a draft of 3.8m (12.5feet). They had an operational diving depth of 40m (130feet). Their crew numbered 2 officers and 23 enlisted men.[1]
For surface running, the boats were powered by two Sautter-Harlé 300PS 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 11.26kn on the surface and underwater. The Émeraude class had a surface endurance of 2000nmi at and a submerged endurance of at .[2]
The boats were armed with four internal 450mm torpedo tubes, two in the bow and two in the stern, for which they carried six torpedoes.[3] and were the first French submarines to be equipped with a deck gun when they were fitted with a single 37mm gun in August 1915.
| Arsenal de Cherbourg | October 1903 | 6 August 1906 | 11 November 1908 | Sold for scrap, 27 January 1923 | |
| 20 November 1906 | 19 December 1908 | Sold for scrap, 10 May 1921 | |||
| 26 June 1907 | 11 December 1909 | ||||
| 6 February 1908 | 10 December 1910 | Sunk by a naval mine, 15 January 1915 | |||
| 2 July 1908 | Sold for scrap, 10 May 1921 | ||||
| 3 August 1908 | Damaged by Ottoman gunfire and beached on 30 October 1915. Re-floated and repaired by Ottoman forces; renamed Müstecip Onbaşı, but never commissioned. Returned to France and sold for scrap, 14 April 1920 | ||||