mmmhmmm...and I suppose next you're going to tell me they all used towed active sonar arrays or had MAD systems on board...perhaps sonar bouys...and they all carried anti-submarine rockets, mines and torpedoes. I know what most of that list used and how it was deployed but I'd like to see if you did your homework before bringing it up.
MAD, as in Mutually Assured Destruction?
Magnetic Anomaly Detection...
SUBMARINE FURBALL
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pics. thats it, nothing else gyrene81