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Fallout 3 Hints
Escort the scientists inside Project Purity.
1 of 4: Wait until everyone else goes in through the gift shop door, then go in yourself.
2 of 4: Follow your father as he slowly walks to the nearest rotunda door.
3 of 4: After he goes through it, follow him in and up the stairs.
4 of 4: When he stops next to a machine, talk to him and ask what needs to be done now.
