Diamantina Deep Diamantina Deep The Diamantina Deep is located in the Diamantina Trench southwest of Perth, Western Australia. The Diamantina Trench is in the eastern part of the larger Diamantina Fracture Zone, which stretches from the Ninety East Ridge to the Naturaliste Plateau, off the lower part of Southwest Australia. It is one of the deepest points (surpassed by the Sunda Trench) in the Indian Ocean at . It is located about west-southwest of Perth at . A survey in 1961 by the Australian oceanographic survey ship confirmed the bathymetry and conducted a scientific survey. The trench (and the Fracture Zone) was
HMAS Diamantina (K377) High Command to the surrender of Torokina on 8 September 1945. She was also involved in the surrenders of Nauru on 13 September and Ocean Island on 1 October; both ceremonies conducted on her quarterdeck. "Diamantina" returned to Sydney, arriving at Garden Island on 13 December 1945, with 78 passengers embarked. The ship remained in Sydney until 1 February 1946, when she departed for a patrol in New Guinea waters. "Diamantina" returned to Sydney in mid-June, and after sailing to Williamstown was paid off into reserve on 9 August 1946. The ship was awarded the battle honour "Pacific 1945" for