So we have had these nuclear submarines hiding in the oceans and listening for other submarines for the last fifty years. And in this time we have not charted out the bathymetry to a high degree of accuracy?
I don't believe the navies need centimetre resolution bathymetry however if they had it then they would keep quiet about it much like how the National Reconnaissance Office keep quiet about their spy satellites.
Given the purposes of military submarines, most of the ocean is not useful to visit, and most of that "uninteresting" ocean is too deep for those submarines to care about.
I don't believe the navies need centimetre resolution bathymetry however if they had it then they would keep quiet about it much like how the National Reconnaissance Office keep quiet about their spy satellites.