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Fallout 3 Hints

Cycle the airlock.

  • 1 of 5: You get this objective if you have Sentinel Lyons or a follower go into the radioactive chamber for you.
  • 2 of 5: After you finish talking to whoever you're sending in, wait until he positions himself in the airlock chamber.
  • 3 of 5: 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.
  • 4 of 5: To let Lyons (or whoever) inside the main chamber, use the airlock control that's next to the window a bit left of the intercom.
  • 5 of 5: After that, just wait and watch as the ending cut-scene plays out.