French submarine Calypso (1907)

Calypso was one of two s built for the French Navy () in the first decade of the 20th century.
Design and description.
The "Circé" class were built as part of the French Navy's 1904 building program to a double-hull design by Maxime Laubeuf. The submarines displaced surfaced and submerged. They had an overall length of , a beam of , and a draft of . Their crew numbered 2 officers and 20 enlisted men.
For surface running, the boats were powered by two German MAN diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a electric motor. During her surfaced sea trials on 19 February 1909, "Calypso" reached a maximum speed of from ; during her submerged trials on 27 July she reached from . The "Circé" class had a surface endurance of at and a submerged endurance of at .
Construction and career.
The "Circé"-class submarines were ordered on 8 October 1904. "Calypso" was laid down in 1905 at the Arsenal de Toulon, launched on 24 October 1907 and commissioned on 5 August 1909.