HMAS Platypus, was a Royal Australian Navy

Royal Australian Navy

The Royal Australian Navy is the naval branch of the Australian Defence Force. Following the Federation of Australia in 1901, the ships and resources of the separate colonial navies were integrated into a national force: the Commonwealth Naval Forces...

 (RAN) submarine base

Submarine base

A submarine base is a military base that shelters submarines and their personnel.Examples of present-day submarine bases include HMNB Clyde, Île Longue , Naval Submarine Base Kings Bay, Naval Submarine Base New London, and Rybachiy Nuclear Submarine Base .The Israeli navy bases its growing submarine...

 at Neutral Bay

Neutral Bay, New South Wales

Neutral Bay is a harbourside suburb on the lower North Shore of Sydney, New South Wales, Australia. Neutral Bay is located 5 kilometres north of the Sydney central business district, in the local government area of North Sydney Council....

, Sydney

Sydney

Sydney is the most populous city in Australia and the state capital of New South Wales. Sydney is located on Australia's south-east coast of the Tasman Sea. As of June 2010, the greater metropolitan area had an approximate population of 4.6 million people...

, Australia

Australia

Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...

. It was located upon the site of the Royal Australian Navy Torpedo Maintenance Establishment (RANTME).

HMAS Platypus was commissioned on 18 August 1967, conjointly with the Australian Fourth Submarine Squadron as the eastern Australian base for the six RAN Oberon class submarine

Oberon class submarine

The Oberon class was a 27-boat class of British-built diesel-electric submarines based on the successful British Porpoise-class submarine....

s.

While the submarines operated from the waterfront, the RAN’s torpedo workshops occupied the southern part of the site.

In 1999, HMAS Platypus and the torpedo workshops closed down when the Commonwealth decided to relocate its submarine base to HMAS Stirling

HMAS Stirling

HMAS Stirling is the Royal Australian Navy's primary base on the west coast of Australia. It is located on Garden Island in the state of Western Australia, near the city of Perth...

 in Western Australia

Western Australia

Western Australia is a state of Australia, occupying the entire western third of the Australian continent. It is bounded by the Indian Ocean to the north and west, the Great Australian Bight and Indian Ocean to the south, the Northern Territory to the north-east and South Australia to the south-east...

.

The site was handed over to the Sydney Harbour Federation Trust

Sydney Harbour Federation Trust

The Sydney Harbour Federation Trust is an Australian Government agency established in 2001 to preserve and rehabilitate a number of defence and other Commonwealth lands in and around Sydney Harbour. These lands were off limits to the public, some for over 100 years...

in 23 July 2005, and is currently closed to public access while remediation works of the ground contamination and buildings on the site is undertaken.