 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.This was shallower than previously thought, and confirmed that the Sunda Trench, rather than the Diamantina Fracture Zone, contains the deepest point in the Indian Ocean.