operating area was surveyed by the support ship, the Deep Submersible Support Vessel DSSV Pressure Drop, with a Kongsberg SIMRAD EM124 multibeam echosounder system. The gathered data will be donated to the GEBCO Seabed 2030 initiative. The dive was part of the Five Deeps Expedition. The objective of this expedition is to thoroughly map and visit the deepest points of all five of the world's oceans by the end of September 2019. 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, recording a maximum water depth of ± at 33°37'52" S, 101°21'14" E for the Dordrecht Deep. This confirmed that the Sunda Trench was indeed deeper than the Diamantina Fracture Zone. Associated seismicity The subduction of the Indo-Australian Plate beneath a bloc of the Eurasian Plate is associated with numerous earthquakes. Several of these earthquakes are notable for their size, associated tsunamis, and/or the number of fatalities they caused. Sumatra segment 1797 Sumatra earthquake: magnitude ~8.4 1833 Sumatra earthquake: magnitude 8.8–9.2 1861 Sumatra earthquake: magnitude ~8.5 1935 Sumatra earthquake: magnitude 7.7 2000 Enggano earthquake: magnitude 7.9 2002 Sumatra earthquake: A magnitude 7.3 earthquake that occurred at the boundary between the rupture areas of the 2004 and 2005 earthquakes listed below. 2004 Indian Ocean earthquake and tsunami: Mw 9.1–9.3 2005 Nias–Simeulue earthquake: magnitude 8.6 September 2007 Sumatra earthquakes: Series of earthquakes, the three largest were magnitude 8.5, 7.9 and 7.0. 2008 Simeulue earthquake: magnitude 7.4 near the 2002 event. 2009 Sumatra earthquakes: magnitude 7.9 2010 Mentawai earthquake and tsunami: magnitude 7.7 Java segment 1917 Bali earthquake: magnitude 6.6 1994 Java earthquake: magnitude 7.8 2006 Pangandaran earthquake and tsunami: magnitude 7.7 2009 West Java earthquake: magnitude 7.0 2019 Sunda Strait earthquake: magnitude 6.9 See also Banda Arc List of islands of Indonesia Plate tectonics Sunda Arc Sunda Islands Greater Sunda Islands Lesser Sunda Islands Sundaland Oceanic trench References Further reading Špičák, A., V. Hanuš, and J. Vaněk (2007), Earthquake occurrence along the Java trench in front of the onset of the Wadati–Benioff zone: Beginning of a new subduction cycle?, Tectonics, 26, TC1005 Extreme points of Earth Lowest points of the World Ocean Oceanic trenches of the Indian Ocean Geology of Indonesia Subduction zones