HMS J4 (later HMAS J4) was a J-class submarine

Submarine

A submarine is a watercraft capable of independent operation below the surface of the water. It differs from a submersible, which has more limited underwater capability...

 built by HM Dockyard at Pembroke

Pembroke Dock

Pembroke Dock is a town in Pembrokeshire, south-west Wales, lying north of Pembroke on the River Cleddau. Originally a small fishing village known as Paterchurch, the town was greatly expanded from 1814 onwards following the construction of a Royal Naval Dockyard...

 in Wales

Wales

Wales is a country that is part of the United Kingdom and the island of Great Britain, bordered by England to its east and the Atlantic Ocean and Irish Sea to its west. It has a population of three million, and a total area of 20,779 km²...

 and launched on 2 February 1916.

She was transferred to Australia on 25 March 1919 and operated out of Geelong until 12 July 1922, when she was paid off.

J4 was sold on 26 February 1924, but sank at her moorings at Williamstown, Victoria

Williamstown, Victoria

Williamstown is a suburb in Melbourne, Victoria, Australia, 8 km south-west from Melbourne's central business district. Its Local Government Area is the City of Hobsons Bay. At the 2006 Census, Williamstown had a population of 12,733....

 on 10 July 1924. She was raised and scuttled in ship graveyard

Ship graveyard

A ship graveyard or ship cemetery is a location where the hulls of scrapped ships are left to decay and disintegrate, or left in reserve...

 off Port Phillip

Port Phillip

Port Phillip Port Phillip Port Phillip (also commonly referred to as Port Phillip Bay or (locally) just The Bay, is a large bay in southern Victoria, Australia; it is the location of Melbourne. Geographically, the bay covers and the shore stretches roughly . Although it is extremely shallow for...

Heads.

The J4 wreck, also known as the "Shallow" or "90 foot Submarine", is submerged in 27 metres (88.6 ft) of water in the ship graveyard and is a popular dive site.