This data set was acquired with a ship-based Knudsen 320BR Subbottom Seismic system during Laurence M. Gould expedition LMG0903 conducted in 2009 (Chief Scientist: Dr. Robert Blanchette). These data files are of SEGY format and include Active Subbottom Seismic shot data that have not been processed. Data were acquired as part of the project(s): Microbial diversity in historic woods, organic substrates and soil and Abrupt environmental change in the Larsen Ice Shelf system, and funding was provided by NSF grant(s): ANT07-32467.