Ok, so I'm doing the quest Still in the dark, and right now I'm trying to do the part where I need to search the area vaults for various items for the Brotherhood. I'm down to looking for hepa filters and the last notifier on my map is in vault 22. I swear I cannot get to the notifier inside the vault, anyone who knows exactly where that item is would be doing me a GREAT favor! Over 3hrs on this!!!!!

Once you get in the Vault, there's a door to go to the caves on the third floor that you can't open even by lockpicking. You need to get a keycard that's in the living quarter's on the 4th floor (it's red and on a shelf in one of the rooms). Once you get the keycard, open the door to the caves on the third floor, take the path to the right at the first intersection you come to (it should be pretty much right after the door. Then go through the door (I think it technically takes you up to the 2nd floor. Take that path, which will take you into a room with lockers in a couple of the corners. The filters are in one of the lockers. (I think it's back right from where you enter the room.)

Could it be a glitch? I search the living quarters and can't find the keycard!

Wait, screw that!!! I just checked my inventory and I HAVE that keycard, yet I can't open the door!!! WTF?

WOW I simply was NOT LOOKING at computer to unlock the door!!! I wasted SO MUCH time because I just wasn't thorough!!!