It's all a bit off... not quite identifiable sounds that will make looking around an alien starship all that more scary...
Much of it almost subliminal. If you concentrate you hear it, but as soon as your mind moves away or someone speaks to you it becomes inaudible... yet it's still there.
It's just pottering along in the background as I write... in some ways almost restful yet it is edgy as well.
Just the thing for playing when your party is exploring Traveller Hephaestus by 13Mann Verlag, available hereabouts, for example.