GEBCO (General Bathymetric Chart of the Oceans)

Alternative Title: 
GEBCO Digital Atlas
 
The GEBCO website provides access to bathymetry data free of charge including a global 30 arc-second grid, and the GEBCO One Minute Grid, along with free software for viewing this data. GEBCO also maintains a gazetteer of undersea feature names which can be viewed and downloaded via the International Hydrographic Organization at www.ngdc.noaa.gov/gazetteer
Spatial Coverage: 
International
Data Creator: 
IOC (Intergovernmental Oceanographic Commission)
IHO ((International Hydrographic Organization)
Data Access: 

Freely available on the internet.