This data set was acquired with a ship-based SeaBeam 2112 Multibeam Sonar system during Nathaniel B. Palmer expedition NBP9801 conducted in 1998 (Chief Scientist: Dr. John Anderson). These data files are of MBSystem Compatible format and include Acoustic Backscatter, Swath Bathymetry, and Sidescan data that have not been processed. Data were acquired as part of the project(s): Timing of Retreat of the West Antarctic Ice Sheet, and funding was provided by NSF grant(s): OPP95-27876.