Medusa-class submarine
The Medusa-class of submarines were eight submarines built for Italy from 1911–1912. They displaced 305 tons while submerged, and could travel as fast as eight knots. The class consisted of the "Vellella, Medusa, Argo, Jalea, Espadarte" (built for Portugal), F"isalia, Zoea, Salpa," and "Jantina." The "Medusa" was torpedoed by the on 11 June 1915, and the "Jalea" hit a mine and sank. The other five Italian submarines were stricken in 1918, and the "Espadarte" operated until 1931.