Since 1991, the SDLS has served under the auspices of the Antarctic Treaty (ATCM Recommendation XVI-12) as a role model for collaboration and equitable sharing of Antarctic multichannel seismic reflection (MCS) data for geoscience studies.  During this period, collaboration in MCS studies has more rapidly advanced the deciphering of the seismic stratigraphy and structure of Antarcticas continental margin than previously. SDLS successes come from cooperation of National Antarctic Programs and individual investigators in on-time submissions of their MCS data.  Most do, but some do not.   The SDLS community has an International Polar Year (IPY) goal of all overdue MCS data being sent to the SDLS by end of IPY.  The community science objective is to compile all Antarctic MCS data to derive a unified seismic stratigraphy for the continental margin a stratigraphy to be used with drilling data to derive Cenozoic circum-Antarctic paleobathymetry maps and local-to-regional scale paleoenvironmental histories.