This, the last level, is split right in two - the first half is all marines, the second is full of xenomorphs. As soon as the level starts, cloak. When the lift reaches the top, slash the marine in front of you, then get off and do the same with the Smartgunner on the left. Walk past his body and fall down into a corridor full of lockers and benches. Continue to the end, then pass through the hangar and out via the door on the right. Switch to thermal view, then activate the lift and wait for it to come down - DO NOT GET ON IT! Instead, select your Speargun and zoom in where the lift would normally dock with the top level - you should see two sentry guns. Take them out, then switch back to thermal view and ride the lift up. Go through the doors and then through the doors to the left. Take out any humans in the area and then fall down to the left. Follow the corridor round into the mess hall and then smash the glass in the far right corner with your Wristblades. Jump through and proceed straight on, between t cryo-sleep beds. Follow the corridor round and through the doors, then again through some cryo-sleep beds and round the corner, then past some cryo-sleep beds and into a hangar. Here, there is a door to the far right. Cloak and go through it. Take out all the marines in there, then use your Medicomp and collect the field charge. This is an excellent save point. Switch to electrical view, then proceed back into the hangar, and pull the two switches in the far left corner. Go through the doors and past all the cryo-sleep beds back to the mess hall (it's simple to navigate so I don't need to give directions). Now head left through the doors, follow the corridor round and press the switch on the right. This activates the lift. Ride it up and select your disc. The doors on the left are now open. Walk round the corner and throw the disc at the first xenoborg, then recall it (unless by some small miracle it returned itself to you) and then walk round the next corner and take out the second one. Now proceed down the steps and through the doors, then blow up the crates in the far right hand corner. Proceed through the gap, then down the right hand side to the far end of the corridor. Turn left and you should see some stairs - go up them, then round to the right and enter the emergency escape tunnel. Proceed down it, then go straight through the doors at the end, ignoring the ones on the right. Fall down and go through the doors to enter the hangar. Kill the two Praetorians that fall from the vents, then go up to the top of the steps next to the door you entered by, then proceed through the other door (at t