I believe in real life, it worked best in shallow water. Many uboats used it effectively when they went close to the English Coast late in the war.
The biggest danger from resting on the bottom was an oil leak. It would mark your exact spot because you weren't moving.
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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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