Making a test mission is straightforward.
Jap DD, hdg 180.
US sub, submerged, hdg 0, speed 0, 100 yards off the DD's track. Hit silent running. Fire fish without even taking a peek, go watch for reaction (listen, too, for the GQ sounds).
If they don;t react to that, they won't react period.
Then tweak the sensors to make them insanely good and try again.
That would definitively tell of if it's even possible.
Since you read many accounts of DDs dashing tot he launch point of fish, perhaps the launch noise (as detected by hydrophones) could be heavily bumped up. Course then they'd start evading before the wakes would have been possible to spot I guess.
tater
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