I recently started using acoustic torps to attack convoys in fog. I'll approach using the hydrophone, take a rough course and speed estimate, then which I think I'm ~2kms away from them, launch a couple of T5s in. They almost always find _something_ in a big mass like that. The only problem is that if they only disable a ship, it's hard to find it in the fog to make a kill shot, especially if it's engine is off and it has no hydrophone signature.
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