 "Dordrecht" was the name of a vessel of the Dutch East India Company, which explored the Australian west coast in 1619 and discovered the Houtman Abrolhos.To resolve the debate regarding the deepest point of the Indian Ocean, the Diamantina Fracture Zone was surveyed by the Five Deeps Expedition in March 2019 by the Deep Submersible Support Vessel "DSSV Pressure Drop", equipped with a Kongsberg SIMRAD EM124 multibeam echosounder system.Using the multibeam echosounder system and direct measurement by an ultra-deep-sea lander a maximum water depth of ± at for the Dordrecht Deep was recorded.