I'm not sure where this idea of complete invisibility comes from.
You can do everything right and still get detected! The closer you are, the greater your chances of being detected. The closer to being broadside to the escort, the greater your chances of being detected. If you raise your periscope, the greater your chances of being detected. The later in the war, the greater your chances of being detected. The calmer the seas, the greater your chances of being detected.
All this is true even if you are at silent running and low RPMs.
If you run across the bow of an escort, even at silent speed, odds are good you will be detected.
Just chalk it up to someone dropping a wrench or farting too loud in the head.
Steve
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