Latitude/Longitude extracted from DSHIP. Data acquisition was performed using a multibeam sonar system Simrad EM-122 from Kongsberg. Raw data are delivered within Simrad current multibeam vendor format. SIMRAD raw data can be processed i.e. with the software packages CARIS HIPS/SIPS, Caraibes, QPS Qimera or with the open source software package MB-System (http://www.ldeo.columbia.edu/res/pi/MB-System/).0000_20161108_235306_SO252_EM122.all - 0072_20161110_112405_SO252_EM122.all: No sound velocity profile has been measured for this section of the transit.0073_20161110_233738_SO252_EM122.all - 0165_20161114_205525_SO252_EM122.all: A sound velocity profile has been measured in the Challenger Deep and was used for this section of the transit.0267_20161212_024414_SO252_EM122.all - 0283_20161212_165113_SO252_EM122.all: A sound velocity profile has been measured in the study area in the Bismarck Sea and was used for this section of the transit.These data should not be used for navigational purposes.