HMS J3, Naval submarine wreck in Port Phillip Bay, Australia
The J-class submarine HMS J3 rests at 16 feet depth near Swan Island, with its propellers now displayed at Queenscliffe Maritime Museum.
Built at Pembroke Dockyard in Wales and launched in 1915, HMS J3 served in the Royal Navy before transferring to Australia in 1919.
The submarine remains stand as a testament to Australian naval heritage, representing the first fleet of submarines gifted by Britain after World War I.
The shallow depth and protected location of the wreck make it an accessible diving site for beginners exploring Port Phillip Bay's underwater heritage.
The submarine's batteries found new life after decommissioning, powering an electric trolley at the Mine Depot on Swan Island until the 1920s.
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