Abandoned BoS Bunker

Brotherhood Bunker 13 (simply referred to as the Abandoned Brotherhood of Steel Bunker in-game), is a reinforced subterranean installation that was used by the Mojave Wasteland chapter of the Brotherhood of Steel during their war with the New California Republic (NCR) and the starting point for the add-on Dead Money. It is located slightly south-east of Camp Forlorn Hope.

Exterior
Standing on the metal grate to enter the bunker, directly to the east-south-east, is a hollowed-out rock containing random loot.

Interior
The bunker interior is simple - the entrance contains a set of stairs leading to a main corridor from which two rooms can be accessed. There are several Sierra Madre Casino posters on the wall, and the graffiti at the entrance reads "Gone to Sierra Madre" and "I left my ♥ in Sierra Madre." There is a headless male corpse with some minor loot in the first room. This corpse is an immovable container, not a body, so although it appears to wear a Dead Money jumpsuit, one cannot be taken from it.

The room to your left after you descend the stairs is locked. Once you have unlocked the door, you will find a Sierra Madre vending machine, both a reloading and work bench, numerous crafting items (notably scrap metal, scrap electronics, and sensor modules), copious amounts of scotch, Elijah's chemistry set (which offers a Jar of cloud residue every 24 hours), a laser rifle, a combat knife, a T-45d power helmet, and a Dean's Electronics skill book. You may clean the loot out of the room before going to the Sierra Madre, but the footlocker at the base of the bed (containing Father Elijah's robes) and the terminal on the desk cannot be accessed until after you have returned. Along one of the walls, someone has scribbled a series of mathematical formulas on a large blackboard.

A "drop box" (smaller version of a wall safe) can be found across from the wall-mounted terminal just outside the room. Everytime upon entering the bunker again after being away for 3 days or so, there will be Sierra Madre chips (and if the player won 7,500 chips in the Sierra Madre Casino, a Complimentary voucher) inside the drop box. How long you have been away will account for how many chips and vouchers you'll find in the drop box.

The room ahead consists of several bunk beds attached to the walls on both the left and right hand side, underneath each bed is a footlocker. Situated in the middle of the room is a table adorned with an active old fashion radio.

Appearances
Abandoned Brotherhood of Steel bunker appears in Fallout: New Vegas and its add-on Dead Money.

Bugs

 * The bunker's exit hatch may say that you need a key to exit back to the Mojave Wasteland (thus becoming a prison), even after completing Dead Money. The solution to this is removing the system cache from your hard drive then starting up the game. Once it gives you the choice to update, click cancel and continue on from there. Load up your saved game and you will be able to exit the bunker back to the Mojave Wasteland.
 * (may be due to lasted update) everything in the abandoned BOS bunker or any items from dead money are no where to be found, including stationary objects found like the old fashioned radio, Elijah's bed/vending machine, or obtained items like the automatic rifle and police pistol. This was caused by the localization of DLC, as a person in Canada Needs French/English Canadian version, and with the preorder DLC packs, the french version is required.
 * Because the lock cannot be picked, the only way into the Abandoned Bos Bunker in the first place is by obtaining a key from Hardin at Hidden Vally after he has become the elder. Though you may obtain this key, many times the grate to the bunker will still be locked and cannot be opened.