There was a short lived thread "if you ___ you may be detected"
Some were pretty good like
If a DD suddenly changes course and steams at flank straight at you you may have been detected.
If you hit flank by accident while laying in wait at periscope depth.. you may have been detected.
If you hit S(urface) when you meant to hit D(ive) you may have been detected.
If a merchant suddenly starts lobbing shells in your direction...
Well you get the idea.
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