I've tried to use this to my advantage with mixed results. Usually the only thing that helps me is a merchant blocking the path of an escort. Recently, I hit a passenger liner with one torpedo and it went dead in the water. I managed to get it between me and an escort and the escort hedgehogged both me and the liner, sinking it and damaging my boat so go figure. I haven't had much success with staying right under a merchant for very long but it seems like it would be helpful to some extent.
scrapser
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