"HMAS J4 was a J class submarine built by HM Dockyard at Pembroke in Wales and launched on 2 February 1916, was transferred to Australia on 25 March 1919 and operated out of Geelong in Victoria, paid off on 12 July 1922, was sold on 26 February 1924 but sank at her moorings at Williamstown on 10 July 1924, was raised and scuttled off Port Phillip in 1927" Source: Wikipedia.org
J4 submarine is the shallowest of the subs located outside Port Phillip Bay. The wreck is broken in half.
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