HMAS Diamantina, River-class frigate at Queensland Maritime Museum, South Brisbane, Australia

HMAS Diamantina is a River-class frigate resting on a slipway in the South Brisbane Dry Dock at the Queensland Maritime Museum. Its grey superstructure carries a tall vertical mast, thin funnels and small guns, with round life rafts along the side; aft, a white canvas canopy covers the rear deck, and the name DIAMANTINA is painted near the stern.

Laid down at Walkers Limited in Maryborough on 12 April 1943 and commissioned at Hervey Bay on 27 April 1945, Diamantina supported Australian Army operations at Bougainville in July and August 1945. Japanese officers were carried to the surrender of Torokina on 8 September 1945, and the surrenders of Nauru and Ocean Island were signed on her quarterdeck. Recommissioned on 22 June 1959 as a hydrographic and oceanographic vessel, she served until 29 February 1980.

The ship displays how the Royal Australian Navy operated in the post-war years and what daily tasks sailors performed aboard. Visitors can see this firsthand by moving through different areas and observing the equipment and spaces used for life and work at sea.

Visitors can explore multiple decks including the bridge, engine room, and crew quarters to understand how a warship functioned internally. Comfortable shoes are recommended as navigation involves climbing narrow stairs and moving through low passageways typical of naval vessels.

During a scientific expedition in the 1960s, the vessel discovered the deepest point of the Indian Ocean while conducting research missions. This location was subsequently named Diamantina Deep in honor of the ship's contribution to oceanographic knowledge.