It's my understanding on wakehomers that they detect the water disturbances left by a ship. In that case, a sub underwater should be trackable by one, as they also leave a disturbance in the water. It's just, with a serface ship, you only have two dimensions to worry about to get the torp to run over the wake. With a sub, you have to figure out it's exact depth in order for the torp to find the 'wake'.
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