With just RUB, I've noticed the boat having negative bouyancy.
Sometimes, when I slow down to 1 or 2 knots my boat starts to sink.
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U.Kdt.Hdb B. I. 28) This possibility of using the hydrophone to help in detecting surface ships should, however, be restricted to those cases where the submarine is unavoidably compelled to stay below the surface.
http://www.hackworth.com/
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