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Originally Posted by johnno74
So yes, the sonar reflects off the seafloor - but the density change going between the sea and the seafloor is much smaller than the density change between your u-boats pressure hull and the air inside it.
This means your u-boat acts amost like a mirror for active sonar - while the return from the seafloor isn't nearly as strong.
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Hmm, so boats sitting on seabed and evading DD's successfully in the movies are total crap then?