This is the Cathedral bomb room section of the map of the wasteland presented by:
This is the bomb room. You know when you kill the master an atom-bomb goes off? This is where the atom-bomb is. There is only two guards so you should have no trouble taking them out. Then go to the computer and play with it for a while. It will give you a list of ways to time the bomb, choose the best one for you and get out of there fast! See, there is a way to kill the master and blow up the cathedral without going near the master, cool no?