HMS J2

HMS J2 (later HMAS J2) was a J-class submarine built for the Royal Navy by HM Dockyard at Portsmouth in Hampshire and launched on 6 November 1915.

J2 torpedoed and sank the German submarine SMU U-99 between the Orkney Islands and Norway on 7 July 1917. She was transferred to Australia on 25 March 1919, and operated out of Geelong until she was paid off on 12 July 1922

J2 was sold on 26 February 1924. She was scuttled in the ship graveyard off Port Phillip Heads at -38.31361°N, 144.58°W.

The J2 wreck, also known as "39 Metre Sub", "130 Foot Sub", "Broken Sub" or "Deep Sub", is submerged in 39 m of water. The wreck lies on its keel running North-South with its bow pointing out to sea. During its scuttling the bow section broke off, exposing the forward torpedoes tubes and bow modifications. The wreck is accessible by experienced divers, but it is the deepest and most difficult of the four J class submarine wrecks in the area.