Before finishing a game (you'll return to the main hub area and there are gonna be all crew members + cryogenics rooms gonna be opened), you need to go to Cryogenics room that on the opposite side from same room but with two characters in it.
In this Cryogenics room, you'll find turned down cleaning robot called "Juliet". Turn it on, take it and then throw it into same cleaning robot that floating around in this hub, called "Romeo".