I'm certainly not one to defend the accuracy/research of SH4, which is lacking in so many ways, but the US subs did have countermeasures towards the end of the war,and they were used in combat (there's a patrol report from Barb where they use both swim-out decoy beacons, and bubblers.
Obviously such devices should only become available when they were actually available (late '44 or early '45?).
tater
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