DeepFlight Challenger point of each of the world's five oceans, the Mariana Trench of the Pacific Ocean (36,201 ft), the Puerto Rico Trench of the Atlantic Ocean (28,232 ft), the Diamantina Trench of the Indian Ocean (26,401 ft), South Sandwich Trench of the Southern Ocean (23,737 ft), and Molloy Deep of the Arctic Ocean (18,399 ft). The Cheyenne yacht will be used as the mothership for the dive efforts. It was planned that Branson would pilot the sub to the Puerto Rico Trench, while Chris Welsh would pilot it for the Mariana Trench dive. Virgin Oceanic had hoped to be the first
HMAS Diamantina (K377) complement of 140. "Diamantina" was laid down on 12 April 1943 at Walkers Limited in Maryborough, Queensland. She was launched on 6 April 1944, and commissioned into the RAN at Hervey Bay, Queensland, on 27 April 1945 carrying pennant number K377. She was named for the Diamantina River in Queensland, and was one of eight River-class frigates built for the RAN during World War II. After commissioning, "Diamantina" sailed to Sydney, New South Wales, remaining there until late May when she embarked for New Guinea to complete her trials. These were concluded in June 1945 and by the end of