Satellite control building

[Lich]

Its placed at south west edge (and bit up) of map on mountain wall, very hard to climb there (am used barrel and shopping cart from nearby village) I thought its another, maybe secret vault but at door is message: satellite control building need key.

Is this part of quest or secret location (finding and climbing there was weird too difficulty) Am playing Fallout3 game of the year

 

[Ohaimerk]

That is an exit point for part of the Broken Steel DLC, the entrance is the car tunnel to the south. Both are inaccessible until the quest starts


http://fallout.wikia.com/wiki/Satellite_relay_station