Silent running isn't the same as dead silent. It only means that you shut down functions like pumps that ain't vitally important for your survival. You do not perform any activity like repair jobbs or torpedo loading or any such work that might make noice. The crew doesn't move around if not necessary and keep al noice to a minimum. All in all, you keep the noice your u-boat makes down to a minimum but you will always be making some noice. It makes it harder for others to hear you but they can still pick up sounds if they happend to be in the right place at the right moment.
Silent running is not a cloaking device.
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