I have picked one of the 2 very hard locks to get inside the bomb storage facility. Once inside, I found a room that has a sentry bot inside. The door is locked and requires a key to get inside. I cannot find the key to this room. Anyone know where it may be hiding? I know there is a sentry bot in the room, because you can see him on radar and here him talking. It reminds me of the Amory in megaton and wherever else an Amory is, so I assume thats what it is, just need the key.
Thanks.

Fort Constantine is a part of a quest called You Gotta Shoot Em In The Head. In Underworld, there should be a ghoul named Mr. Crowley in The Ninth Circle. He asks you to kill certain people and take keys off their bodies. If you're playing a Good character, you can find alternatives to this. Talk to him and he'll set you on your way. Just a note: If you do what he asks you to and you give him the keys, follow him out of Underworld and kill him and take them back. The keys are needed for the strongest armor in the game. He'll take it and disappear from the map.