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Fallout 3 Hints
Open the Vault door.
1 of 4: After the big desk finishes moving out of the way, go down the stairs it reveals.
2 of 4: Open the door past the stairs, ready to squash a radroach in the corridor past it.
3 of 4: Go through the door to the Vault 101 Entrance area, then go straight ahead to a wall segment that will lower when you use the switch to the right of it.
4 of 4: In the large room ahead, find and use the vault door control pad that's just to the right of the stairs that lead down to the vault door.