Even though you are at 0 knots and silent running there are still sounds coming from your boat. Depth keeping etc make some noise
To maintain depth, ballast must be moved between tanks etc.
To answer your question, with TMO 1.9 late war you're not.
Even in real life they started taking longer shoots as IJN sonar improved.
Magic
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Reported lost 11 Feb. 1942
Signature by depthtok33l
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