One thing I've tried against enemy boats is closing to "snap fire" a decoy and a Mark 48 diverging away from each other between 15 to 20 degrees then dropping 200 feet if possible. I've fared pretty good with the enemy going after the decoy while I bring the torpedo in for a close activation homing strike. I then spiral dive 400 feet, pop off a sound decoy and 180 out away from the combat action into silent running.
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