hey guys,

another sub question for you submarine know-it-alls or anyone else who might know.....

as far as underwater detection, ranging and stuff like that, do submarines only use passive and active sonar when theyre underwater or is there another way that they are able to accomplish the same purposes, if there are any what are the pros and cons.

thanks much once again guys....
active sonar is very helpful when the submarine is underwater. The cons are just that as the submarine sinks deeper, the less sensitive the active sonar becomes.
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