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How do you get the hidden vault 101 quest in Fallout 3

How do you get the hidden vault 101 quest in Fallout 3
If you are talking about the "Trouble on the Homefront" quest its after you complete Project purity. Travel to a relative distance from 101, Megaton for instance, and you will hear the Vault 101 distress signal on you Radio, listen to it and you will then know what to do. Good luck.