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Fallout: New Vegas Game Add-Ons (DLC) Hints
Gain access to the Sierra Madre Vault.
1 of 4: Return to the Executive Suites area and go back to the southern room where you left Christine.
2 of 4: Talk to her until she agrees to say the words to open the vault for you, then follow her to the vault entrance and wait until you get the next objective.
3 of 4: Or you can do the same thing without her. Use the terminal next to the locked door that's across from her room to open it, then go through it to find the vault elevator.
4 of 4: Use the microphone that's to the right of the elevator and choose OK, then use it again and choose to play the Starlet's voice from your Pip-Boy. (Note that you'll have to do it this way if Christine is dead.)
