HMAS Diamantina is a River-class frigate of the Royal Australian Navy, named after the Diamantina River in Queensland. Constructed by Walkers Limited in Maryborough, she was laid down on 12 April 1943, launched on 6 April 1944, and commissioned at Hervey Bay on 27 April 1945. She has a displacement of 2,120 tons when fully loaded and 1,420 tons standard. Powered by two triple expansion engines generating 5,500 indicated horsepower, she could reach speeds of up to 20 knots and had a range of 5,180 nautical miles at 12 knots. Initially serving during World War II, Diamantina participated in the Bougainville Campaign, providing fire support to Australian forces in July and August 1945. She shelled Japanese positions on Sohana and Taiof Islands and was involved in the surrender ceremonies of Japanese officers, including Lieutenant General Kanda and Vice Admiral Baron Samejima, at Torokina in September 1945. Her wartime service earned her the battle honor "Pacific 1945." After hostilities, she returned to Sydney and was placed in reserve in August 1946. Recommissioned in 1959 as a hydrographic, meteorological, and oceanographic research vessel, Diamantina conducted numerous surveys, including the first survey of waters around the Montebello Islands following the British atomic tests and around Christmas Island. Her notable achievement was the discovery of the deepest part of the Indian Ocean, named Diamantina Deep, in 1960. Based in Fremantle, she remained in service until 1980, with a brief interruption in 1963 when she escorted Queen Elizabeth II’s royal yacht during her Australian tour. Decommissioned on 29 February 1980, she was preserved at the Queensland Maritime Museum as a museum ship. She is one of only two preserved World War II-era River-class frigates and the last of her class to leave RAN service. In recent years, she has been maintained as a museum vessel, surviving the 2010–11 Queensland floods with no damage, and serves as a significant maritime artifact illustrating Australia’s naval and scientific history.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.