There is a boat show going on at Shilshole right now, and this has involved a lot of moving about by a lot of boats. It has been kind of noisy down below for the last few days because of this. Boat propellers are LOUD!
All that fancy gear on submarines is used to detect the prop noise from boats many miles away, and to analyze it and to identify the source. But for boats near or directly above the submarine, trust me, the whole crew knows about them, their only "instrumentation" being their ears, inside the steel bubble of the hull.