When a U.S. submarine ran into an unmapped seamount in the South China Sea two months ago, many wondered how that could happen. It turns out only 19% of the world's sea floor has been mapped. Moreover, the South China Sea is known to have particularly tricky underwater terrain. You can use this mapping tool from the General Bathymetric Chart of the Oceans (GEBCO) to visualize ocean topography: download.gebco.net/ GEBCO is working to produce a complete, publicly available map of the world's oceans by 2030.
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