"Canadian Corvette Sinks An Italian Submarine. 28 January 1943, on Board Hmcs Port Arthur, Mers-el Kebir. the Port Arthur Back in Port After Escorting a Convoy, and Sinking the Italian Submarine Tritone." Two members of the PORT ARTHUR'S crew sitting on deck with the ship's cat "Kitty". They are sitting on a rack of depth-charges.