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Originally Posted by GoldenRivet
some mechanical sounds on board the u-boat could be heard on hydrophones, but the sound of a periscope being raised would be likely bedifficult to hear even if you were standing next to it.
period hydrophones simply were not that great - at least not to the point of being able to hear such a quiet noise.
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In the book Iron Coffins, the author Werner describes as follows, 'The periscope motor hummed continually'. I am guessing that this sounds could be heard from within the control room or from within the conning tower above. I would go along with the general concensus here that ths sound of a periscope being raised/lowered would not be picked up by a sonar operator on a surface vessel.
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