This data set was acquired with a ship-based Kongsberg EM120 Multibeam Sonar system during Nathaniel B. Palmer expedition NBP0507 conducted in 2005 (Chief Scientist: Dr. Marcel Croon; Investigator(s): Dr. Steve Cande and Dr. Joann Stock). These data files are of MBSystem Compatible format and include Acoustic Backscatter, Swath Bathymetry, and Sidescan data that have not been processed. Funding was provided by NSF grant(s): ANT03-38317 and OPP03-38346.