I haven't either been detected underwater by merchants in my U-boat career(only October 1943), but then again I've only seen Liberty Ships, T3 tankers and Small Old split superstructure freighters, none of which receive hydrophones. I haven't checked what kind of ships the game spawns in US convoys, but I imagine it would be entirely possible that a ship or two(one of the Jap ships) with hydrophones could be spawned. I've modded merchant hydrophones out of my own game btw, since I highly doubt they were that common in real life.
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