British J Class Submarine
6 x 18-inch (457 mm) torpedo tubes (4 bow, 2 beam)
The J class of submarines was a seven submarine class developed by the Royal Navy prior to the First World War in response to claims that Germany was developing submarines that were fast enough to operate alongside surface fleets. Six were completed during mid-1916, while a seventh entered service at the end of 1917.
Although larger and more powerful than previous British submarines, the J class could not keep up with surface vessels, and operated independently during the war. Between them, the submarines sank a U-boat, and heavily damaged two battleships, with the loss of J6 to friendly shelling.
Following the war, the six surviving submarines were gifted to the Royal Australian Navy (RAN). All six were paid off during the 1920s. Two were scuttled as breakwaters in Port Phillip Bay, and four were scuttled in the ship graveyard off Port Phillip heads.
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