This data set was acquired with a ship-based Kongsberg EM120 Multibeam Sonar system during Nathaniel B. Palmer expedition NBP1304 conducted in 2013 (Chief Scientist: Dr. Edward Durbin). These data files are of MBSystem Compatible format and include Acoustic Backscatter and Swath Bathymetry data that have not been processed. Data were acquired as part of the project(s): Seasonal Trophic Roles of Euphausia superba, and funding was provided by NSF grant(s): ANT11-42107.