HMS J2, Sunken submarine near Port Phillip Heads, Victoria, Australia.
The J-class submarine measures 83.97 meters in length and rests at a depth of 39 meters beneath the waters of Port Phillip Bay.
Built at Portsmouth Dockyard and launched in 1915, HMS J2 served in World War I and successfully destroyed the German submarine U-99 in 1917.
The submarine represents a significant period in Australian naval development when six J-class vessels were transferred from British to Australian service after World War I.
Marine archaeologists and researchers access the wreck site through specialized diving equipment due to its location at considerable depth near Port Phillip Heads.
The submarine operated with three separate propeller shafts powered by 12-cylinder diesel engines, making it different from standard two-shaft submarine designs of that era.
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