During WW2, submarine-submarine technology and tactics was in its infancy/didn’t exist. Sonar was primitive, anti-submarine homing torpedoes barely existed, and the submarines themselves were slow and had poor underwater endurance. The technology just wasn’t there.
Likewise, the need also wasn’t there. By the point in the war in which ASW-submarines became at all viable(even in theory), the uboat threat was essentially over and conventional ASW tactics and weapons were more than sufficient
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