https://dosits.org/people-and-sound/national-defense/how-is-sound-used-to-find-submarines/
https://www.public.navy.mil/subfor/underseawarfaremagazine/Issues/Archives/issue_25/sosus.htm
https://military.wikia.org/wiki/SOSUS
https://dosits.org/people-and-sound/history-of-underwater-acoustics/the-cold-war-history-of-the-sound-surveillance-system-sosus/