Switch to thermal view, then make your way down the passage. Fall down at the end and begin walking down through the corridor. At the other end, go up the stairs to your left and head through the passage. At the opposite end, select your Speargun and cloak. Shoot the marine that you can see. Fall down into the area below and pull the lever straight ahead. Head right through the corridor and then up the stairs on your right at the end. Go through the passageway and jump over to the now open door. Go through the cave and at the other end head right along the ledge, killing the marine. At the end of the ledge there's a rope - slash it with your Wristblades. Then fall down into the area below, collect the field charge, and fall down the hole where the lift previously was. Go left into the tunnel and at the end head right along the ledge, entering the next passage. At the end, carefully walk along the pipe, collect the field charge, and then carefully tread across the next one. Go down the passageway, but just before you reach the end pull out your Speargun and cloak. Empty the area below of marines and then fall down, switch to electrical view and pull out your disc. Next to the hangar door in front of you, there's a switch. Hit it to open the hangar door. When it opens, waste the xenoborg with your disc, then retrieve it and smash the two sentry guns with your Wristblades. Press the button on the wall to cycle the doors and open the one you want. Head right down the corridor and go through the door at the end. Here, go through the wrecked APC and head down the tunnel. At the end, take a left and enter the control room. Go round the central station and destroy the two barrels on the other side. The door next to you will open and some aliens will emerge dispose of them and them head back down the tunnel, going left this time when you reach the large area. Head down the passage and across the rocky beam, then go either left or right (they both lead to the same place) and fall down into the area below. Waste the two Praetorian guards and then go forward into the rocky area. At a certain point the floor will fall through. End of level