Links to a number of data archives at the National Geophysical Data Center related to the ocean floor. (
http://www.ngdc.noaa.gov/mgg/geology/geology.html
)
The International Hydrographic Organization is an intergovernmental consultative and technical organization that was established in 1921 to support the safety in navigation and the protection of the marine environment. They also provide information on the depths of the oceans. (
http://www.iho.shom.fr/
)
Exceptional quality images of the mid-ocean ridge system derived from oceanographic survey data. (
http://imager.ldeo.columbia.edu/ridgembs/ne_pac/html/home.html
)