I don't know, it sounds like the situation Erich Topp describes in his SH2 interview.
The escort is bearing down on him, he can see the folks on the bridge, then it drops depth charges, and turns away. He couldn't believe he hadn't been spotted.
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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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