Go inside and turn left at the main fork.
Backtrack to the fork and go through the unexplored main corridor, following O’Neal’s footsteps.
fire up the small door on the left and go upstairs.
Notice that you’ve found yourself in the same spaces where a previous mission had you placing motion sensors.
Move ahead, into the damaged main corridor (the above screenshot).
Take the pathway on the right, towards the labs.
There are three marines to save here that you’re free to locate with the motion tracker.
Watch for Xenomorphs in the meantime, though, especially since there will be Lurkers among them.
Move to the next lab room.
To get to him, fire up the door on the left using the welding torch.
Kill the Xenomorph that will show up there.
Help him get rid of the aliens.
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