Just before we sporkweaseled, Dead Corpse idly mentioned not knowing where the "exits" were.
So, herewith a public service technical aside.
In the event of an emergency, alarm klaxons will sound, and all tube transport will be redirected to the Gas-Cooled Nuclear Reactor/Rocket Engines (the Shuttles) which are our emergency evacuation devices. (On-Duty emergency repair technicians and flight crew will have override command codes to be able to reach duty stations to deal with the emergency.)
Our best estimates for the time required to totally evacuate all habitats is under thirty-five minutes. Your first duty upon reaching your evacuation shuttle is to log in to the computer network and to make yourself comfortable.
If it is determined that the worst of all possible scenarios is at hand, and none of the habitats can be salvaged in any manner, we will complete the evacuation of the the Flying Castle, and begin limping our way back to Earth, a rag-tag flotilla of ... (darn, how does that Battlestar Galactica spiel go?)
That's where the exits are.