I remember in Silent Hunter I when the Japanese pinged you it had a trilling sound like the bell on a kids bicycle. I wonder if the "trill" is what they mean by a gravel sound? My buddy who was on a navy supply ship in the 90's said his ship was pinged by sub at close range and it knocked him out of his bunk! It's kind of a letdown though to find that the pings are not authentic.
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