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  • Underwater camera positioning by sonar 

    Edgerton, Harold E.; Cousteau, Jacques Y.; Hersey, J. B.; Backus, Richard H. (Woods Hole Oceanographic Institution, 1960-03)
    A pulse sonar system is described for measuring the height above the bottom of an underwater camera and other equipment in the deep oceans. Using this method, cameras have been positioned for photography at depths to ...