Paladin Sato is not always at the safehouse, and resides in an inaccessible, empty room several meters past the back wall of the bunker at all other times. Inside, Brotherhood Paladin Sato watches over the bunker and can repair items for the player up to 100%. The safe house is lacking in objects except for a few bunkbeds and other miscellaneous items you'll commonly see in a safehouse. You can only gain entrance to the Brotherhood of Steel Safehouse after you finish the quest Still in the Dark.