I was only a Five Jump Chump, but the first thing that sprang to mind was:
"Keep your feet and knees together, or we'll be here forever!"
Edit: Which has nothing to do with "don't ask don't tell".
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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/