Neptunia launched in 1931, 19,475grt for Cosulich Soc Triestina di Nav by CR dell’ Adriatico, Monfalcone
Torpedoed Mediterranean 1941 by HMS Upholder.

The submarine was commanded for her entire career by Lieutenant-Commander David Wanklyn, and became the most successful British submarine of the Second World War. Wanklyn was awarded the Victoria Cross for a patrol in her in 1941, which included an attack on a particularly well-defended convoy on 24 May 1941 in which Upholder sank the 17,879 GRT Italian troop ship Conte Rosso. On 28 July 1941 she damaged the Italian cruiser Giuseppe Garibaldi (9500 tons). On 18 September 1941 she sank two troopships within hours of each other: the sister ships MS Neptunia and MS Oceania