Our sweep is complete, sir. We've been over every square meter of this ship and there's nobody home.
There are unfinished meals, and infrared traces on some of the furniture. Whoever used to be here hasn't been gone very long.
Oooh! Did you check the air vents?
Nobody who has seen you in action fails to check air vents, Sergeant.
. . . 'cause that's right where I'd be.