Presidential Metro

The  is a network of metro tunnels that is added to Fallout 3 in the Broken Steel add-on.

Layout
It connects the Presidential Sub Level beneath the White House with Adams Air Force Base and The Capitol Building's East Wing. Protected and maintained by a computer system called M.A.R.Go.T., the area is guarded by Sentry Bots and swarming with ghouls.

Unmarked quest: Fatal Attraction
A holo-tape titled "Sorry, My Darling" can be found on a bench near the Capitol Building exit. The holo-tape kicks off the A Fatal Attraction unmarked quest.

Notable loot

 * Nuka-Cola Quantum in the Equipment Room, which connects the western and eastern lines.
 * Scoped .44 Magnum at the top of a flight of rubble covered stairs. Dogmeat should be able to find it.

Appearances
The appears in the Fallout 3 add-on Broken Steel.

Bugs

 * Occasionally in V.A.T.S. mode, if you are standing near an npc or follower, upon exiting vats, you may become stuck in the ceiling, and be unable to get back down. Reloading a save will fix this, or for PC users you can use console commands.