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    Re: Noisy Sea Surface
    From: Philip Ouvry
    Date: 2003 Nov 17, 18:02 +0100

    This thread has been going on for a long while!
    A fibreglass hull makes an excellent sound box magnifying many underwater
    noises.   If you have a submarine operating its sonar in your vicinity you
    can hear it quite well.   As an aside on one occasion cruising quietly in
    open water we found ourselves in the middle of a naval anti-submarine
    warfare exercise.   Happening to glance down in the water we saw a submarine
    right below us using us as a cover to avoid detection.   Later in the
    exercise the submarine did an emergency surface about 60 metres away coming
    out of the water at an angle of 30 degrees.   Fortunately we were not in the
    Philip Ouvry

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