If the contact starts to get louder it getting closer.
But pay attention to his bearing changes to work out what he is really up to. A contact may get louder (closer) but is he going past you?
If its an escort and it looks like he's just steaming close by thats the time to go silent and order all stop. Remember to alter your depth when you order all stop! (Don't want to broach the surface now).
If he's heading straight for you... Well good luck Herr Kaleun, better you than me!
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Sir Humphey Appleby, GCB, KBE, MVO and MA. Britain's Greatest Orator, well bar that Churchill fellow.
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