This data set was acquired with a Kongsberg Maritime EM122 Multibeam Sonar during R/V Nathaniel B. Palmer expedition NBP1501 conducted in 2015 (Chief Scientist: Dr. James Girton, Investigators: Dr. James Girton, Dr. Dean Roemmich). 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): Collaborative Research: Pathways of Circumpolar Deep Water to West Antarctica from Profiling Float and Satellite Measurements. Funding was provided by NSF award(s): PLR13-41496.