Here are a couple of more old films for you. Quite the "stroll down memory lane".
Project CAESAR Shore Analysis Equipment https://www.youtube.com/watch?v=zPuyHCXl9ao
OT Recruiter Film https://www.youtube.com/watch?v=OCXSGCd-3FY
Technologies for Ocean Acoustic (Sound) Monitoring The Secret Weapon of Undersea Surveillance
http://www.public.navy.mil/subfor/underseawarfaremagazine/Issues/Archives/issue_25/sosus.htm
I'll add one more for your watching enjoyment. It shows what actually happens when a sonobuoy hits the water. It appears to be made up of several clips based on the time indicator.