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Fallout 3 Hints
Tell your follower to start the purifier.
1 of 4: You can only get this objective if you have the Broken Steel add-on game installed.
2 of 4: When Sentinel Lyons says someone has to go in there, you can volunteer a radiation-proof follower (such as Fawkes or Charon) if you have one with you.
3 of 4: If you want to carry out President Eden's "mutant purification" goal, enter the airlock chamber yourself, use the auxiliary filtration input console, and choose to insert the modified FEV virus.
