Izzie knows.

[ Nathan grinned and reached over to touch his brother on the head, and then they were setting off. The moment they were beyond the kitchen door Peter said. "Izzie, walkies!" And she span in circles and began to go bolting up and down the corridor, leading them along to the elevator door.

To be quite fair, Nathan had been training her to do it in a certain way. He had no intention of getting lost, not knowing the way back to the elevator. Izzie never got lost, she always knew the way back, and so long as you got to an elevator you stood a chance of finding someone else or working out where you were--or that was Nathan's plan anyway. Of course it meant you had to have Izzie with you, and it assumed that the screwed up ship wouldn't get her just as lost if it ever came down to it. ]

We can sit up and play cards, or something. while I get you up to speed on the ship and--well, there's a whole lot about the ship.

[ He set the elevator to take them to the garden and leant against the rail. ]

It'll take about ten minutes. This one takes us all the way along the ship. The Oxygen gardens are right at the back, near Engineering.