HMS J3 (later HMAS J3) 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 for the Royal Navy

Royal Navy

The Royal Navy is the naval warfare service branch of the British Armed Forces. Founded in the 16th century, it is the oldest service branch and is known as the Senior Service...

 by HM Dockyard at Pembroke Dock

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 4 December 1915.

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

J3 was sold in April 1924 and scuttled off Swan Island in 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...

at 38.244075°N 144.70305°W in 1926.