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DOOM 3: Resurrection of Evil Hints
How do I unlock the door in Main Sewer Access?
1 of 4: According to the door panel, you need Fred Grossman's PDA, so go back to the areas you've been through to see what you've missed.
2 of 4: Back in the Sewage Stairwell area, notice that there's an unlocked door down at the bottom of the stairs.
3 of 4: It leads to the Blocked Passage room, which has the PDA you want on the lower floor in a corner.
4 of 4: TIP: That PDA also unlocks the nearby Armory door, as well as having the combo for the two storage lockers past it.
