sentences:  As of 1996, the standard payload of an Australian "Oberon" was a mix of 20 Mark 48 Mod 4 torpedoes and Sub Harpoon missiles.Some or all of the torpedo payload could be replaced by Mark 5 Stonefish sea mines, which were deployed through the torpedo tubes.On entering service, two stern-mounted, short-length torpedo tubes for Mark 20 anti-submarine torpedoes.