The National Archive of Marine Seismic Surveys (NAMSS) is a marine seismic reflection profile data archive consisting of data acquired by or contributed to U.S. Department of the Interior agencies. The archived data were collected from 1975 to the present. They include marine seismic reflection profile data acquired originally for purposes of oil and gas exploration within the U.S. Exclusive Economic Zone (EEZ), a national scientific resource of inestimable value. The USGS is committed to safekeeping both agency and industry data on behalf of the academic community and the nation. These data are provided with free and open access.