Things on the boats are all pretty much on sound mounts these days. Under normal steaming conditions, dropping a hand tool is not going to give the boat away. If the boat is rigged for silent running, then ya aint gonna be working anyway.
And as already mentioned, all sonar is on passive.
The way that ships are loosing cargo containers these days, I would not be surprised if that was not the object. Most watch standers are on their feet and surrounded by all sorts of pipes, valves, brackets, cabinets etc. A good bump could throw a sailor into something hard and pointy, especially the guys back aft in engineering.
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