This data set was acquired with a ship-based Kongsberg EM120 Multibeam Sonar system during Nathaniel B. Palmer expedition NBP0709 conducted in 2007 (Chief Scientist: Dr. Stephen Ackley). 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): ANT05-38516.