Bunker #02 becomes a safehouse after the "Black Hawk Down" quest. The leader and only survivor of this safehouse is Nikolai. You can fast travel from this location. There is a level 3 chest up a ladder.
A player can find a manhole cover in front of the door of the room where Nikolai, this shortcut leads apparently to another bunker where we appear in a room with two suiciders (one dead and one alive at the back of the room where show up) that can occur rarely later.