Walk forwards and enter the airlock. Wait for the next door to open, then proceed through it and move into the next area. Pull the lever next to the big glass door to unlock it. Head through the doors and into the main corridor. If you want to, you can go into the room at the end on the right and collect the Sadar and a bit of ammo, otherwise just get head left, down the stairs and through the doors at the bottom. You're now in the Living Quarters area. There are various bonuses and items in the rooms, but there're also a lot of enemies, so personally I'd recommend that you just head down the corridor. Proceed through the door at the end and then straight on to the next one, where you'll need to pull the lever on the left of the door to unlock it. From there, head straight on still, keeping to the corridor. The next door opens automatically, and then you'll emerge in a room offering you two doors to take. You want to go left. Pull on the lever next to the door, then go through both it and the next one. Go straight ahead, up the stairs and round, then over the small metal bridge and through the next door. At the end of the corridor, a small lift will rise up to take you down. Get on it, and when it gets low enough, fall off and run straight for the opening in the corner. The xenoborg is right next to the lift, but ignore it now - it won't chase you. Head up the stairs and onto the lift at the top. Ride it up, then go through the metal grates which open automatically at the top, across another small metal bridge and into the next room. I'd recommend you save it now. Go up the stairs and that hatch will open. You emerge in the hydroponics garden. Watch it, there's a Predator in here (not on Training), so keep moving. Either kill it (not recommended - you can easily save yourself the bother and just run straight past it) or run quickly and pull the lever next to the door. When it unlocks, head straight through it. In this room there's another problem - another xenoborg. If you have the Sadar, it's probably worth killing - two shots will take care of it. When it's dead, or if you're not bothering to dispose of it, head round the ledge at the top and pull the lever next to the door, then proceed into the next room. Fall down into the escape pod to end the level