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DOOM 3 Hints
How do I move on to the next area?
1 of 5: After Sergeant Kelly orders you to find the missing scientist, he'll have a nearby sentry robot lead you to an elevator you need to use.
2 of 5: Follow the 'bot to get led back to the Departure Lounge.
3 of 5: It'll open the locked west door in the lounge for you.
4 of 5: Go through it to reach the room with the elevator.
5 of 5: Use the elevator's control panels to enter it and then descend to the Mars City Underground area.