Masanao Sumiyoshi¹, Rochelle Anne Wigley², Yulia Zarayskaya³, Karolina Zwolak⁴, Seeboruth Shailesh Sattiabaruth⁵, Aileen Bohan⁶, Jaya A Roperez⁷, Tomer Ketter⁷, Evgenia Bazhenova⁸, Mohamed Elsaied Abou-Mahmoud⁹, Ivan Ryzhov¹⁰, Andres Fitzcarrald¹¹, Azmi Rosedee¹², Christina Lacerda¹³, Hadar Sade¹⁴, Neil Tinmouth¹⁵, Craig Wallace¹⁶, Stian Michael Kristoffersen¹⁷, Alison Proctor¹⁸, Wetherbee Bryan Dorshow¹⁹, Benjamin Simpson²⁰, Timothy Kearns²¹, Bob Anderson²² and Robin K H Falconer²³, (1)Hydrographic and Oceanographic Department, Japan Coast Guard, Tokyo, Japan, (2)University of New Hampshire Main Campus, Durham, NH, United States, (3)Russian Academy of Sciences, Laboratory of Ocean Floor Geomorphology and Tectonics, Geological Institute, Moscow, Russia, (4)Polish Naval Academy, Gdynia, Poland, (5)Ministry of housing and lands, Quatre Bornes, Mauritius, (6)Geological Survey of Ireland, Dublin, Ireland, (7)University of New Hampshire Main Campus, Center for Coastal and Ocean Mapping, Durham, NH, United States, (8)NIWA, Wellington, New Zealand, (9)Faculty of Petroleum and Mining Science Matrouh University, Petroleum Geology Department, Matrouh, Egypt, (10)Arctic and Antarctic Research Institute, St Petersburg, Russia, (11)Peruvian Navy, Lima, Peru, (12)Royal Malaysian Navy, Kuala Lumpur, Malaysia, (13)NF/GEBCO Training Alumni, Rio de Janeiro, Brazil, (14)Yam-Yafo Ltd., Rishon Lezion, Israel, (15)NF/GEBCO Training Alumni, Cape Town, South Africa, (16)Kongsberg Maritime AS, Aberdeen, United Kingdom, (17)Kongsberg Maritime AS, Horten, Norway, (18)Ocean Floor Geophysics Inc., Burnaby, Canada, (19)Organization Not Listed, Washington, DC, United States, (20)Hushcraft Ltd, Mersea, United Kingdom, (21)Numurus, Seattle, United States, (22)GEBCO, New York, United States, (23)GEBCO, Wellington, New Zealand