|The following is based on Fallout 3 cut content and has not been confirmed by canon sources.|
Located near Rivet City, Potomac Steamworks consists of a number of underground tunnels and sewers that could potentially be accessed via 2 non-functioning entrance points - a ladder and manhole combination, or a door. The only loot to be found is that upon the bodies of the resident feral ghouls.
Can only be accessed through the console command coc zDCint17to21.
Potomac Steamworks is a location cut from Fallout 3.