The Blue Book was written for 688I, and the TACMAN for SC.
In 688I, missiles fired when the sub was too deep or too fast remain in water for a significant amount of time; perhaps for the rest of the game.
In SC, those same missiles would be deleted a few seconds after they failed. So, even if they did produce an active sonar return, they wouldn't last long enough for this to be a useful exploit.
__________________
|