This data set was acquired with a Kongsberg Maritime EM122 Multibeam Sonar during R/V Nathaniel B. Palmer expedition NBP1709 conducted in 2017 (Chief Scientist: Dr. Paul Matthias, Investigator: Dr. Paul Matthias). These data files are of MBSystem-compatible format and include Acoustic Backscatter and Swath Bathymetry data that have not been processed.