Mason District South

 is part of the Metro system under the Capital Wasteland. It gains access to the Flooded Metro.

Background
This seems to be the closest route to the Shocker, a unique power fist. After entering the station, take the only door and continue down the tunnel to the first door on the East. Expect mirelurks, including several kings, while heading down the stairs. Take the first opportunity to open doors into a tunnel heading East. Watch out for mines while following it to a partially flooded irradiated room with various loot. On top of a barrel is the Shocker and the Shocker Glove note.

Notable loot

 * The Shocker
 * Northeast corner of Flooded Metro (top floor) before you enter the sewers again. To the right of the stairwell, there is a circular pole behind 3 metal boxes and next to a .44 magnum and skeleton, there is a Guns and Bullets.
 * Guns and Bullets in the second story of the building north of the entrance. The building overlooks a park with a bunch of super mutants roaming around.

Bugs

 * The game may occasionally freeze after leveled enemies attack you. Particularly when looting the corpses. Save often.