"c15" was laid down on 7 december 1906 by vickers at their barrow-in-furness shipyard, launched on 21 january 1908, and completed on 1 april. during world war i, the boat was generally used for coastal defence and training in home waters. the boat torpedoed in the english channel on 3 november 1917. she was sold for scrap on 28 february 1922.