Émeraude was the lead boat of her class of six submarines built for the French Navy () in the first decade of the 20th century.
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
Construction and career Émeraude was laid down in October 1903Couhat, p. 138 at the Arsenal de Cherbourg, launched on 6 August 1906 and commissioned on 11 November 1908.Garier 1998, p. 12
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