We would like thank T. Pettigrew and M. Stahl for constructing the PCS, M. Stahl, J. Hohnberg, and M. Kawasaki for operating the PCS during core collection, and W. Borowski and H. Wehner for assistance with the PCS degassing experiments. Funding for this work was provided by the Joint Oceanographic Institutions U.S. Science Support Program. High-pressure equipment was acquired through an NSF grant to G. Brass and M. Kastner to build an Isothermal Gas Hydrate Decomposition System (IDAS). We would also like to thank R. Sassen and A. Waseda for numerous suggestions that improved the final manuscript.