On Kashin-class, sailors from Aviation Dept who refueled Ka-27 right on helipad (no hangar on those ships), were living just below aft gunhouse and above main gearboxes. They freely spoke to each other near the helicopter with running engines. Being surprised by that fact, I've once went down to that bunkroom and was amazed even more - sitting on bunks, those youngsters were just gesturing. The gearboxes' noice at 25 knots was absolutely deafening, as if you have to sleep just on Marshall stage amplifier during the Motorhead or Slayer gig (Metallica is more melodic, in my opinion). But the guys had somehow used to it and slept with pleasure. Youth...
Reminds me of the rats nests of wipers rags and old coveralls I would find tucked behind machinery in the auxiliary machinery spaces on the FFG. Every now and then, I'd catch the snipes sound asleep in the pile with blissful looks on their faces. I really did hate to wake them up. . .