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DOOM 3 Hints
Oh, no! Not another Mars surface expedition!
1 of 6: Yes, but this will be the last one (on this level, anyway).
2 of 6: After you exit to the surface from Service 3, blast the cacodemons floating around nearby.
3 of 6: After you finish with them, your oxygen will probably be low, so get back into the airlock and cycle it again.
4 of 6: Wait a few seconds, then re-exit to the Martian surface and find the airlock on the other side.
5 of 6: Take a left off of the straight path to find a few supplies and, at the far end, the other airlock.
6 of 6: Quickly enter it and hit its interior panel to finish the level.
