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Fallout 3 Hints
Replace the damaged fuses.
1 of 4: Return to the sub-basement, and go down to its big downstairs room.
2 of 4: Go through that room's other doorway, then turn right to enter an area with two small water tanks in it.
3 of 4: Go through the doorway at the other end of the room, then down some stairs.
4 of 4: On the right just past the next doorway is the auxiliary power fuse box that you're after. Activate it to finish this objective.
