This data set was acquired with a Kongsberg Maritime EM122 Multibeam Sonar during R/V Nathaniel B. Palmer expedition NBP1609 conducted in 2016 (Chief Scientist: Dr. Sébastien Bigorre, Investigator: Dr. Sébastien Bigorre). These data files are of MBSystem-compatible format and include Acoustic Backscatter and Swath Bathymetry data that were converted after acquisition.