As soon as you start the chapter, enter the door on the left and then the door immediately to the right, pick up the text log (Log 13 - Tour Staff) on the chair. Climb the stairs in the previous room and enter the door here you will find a save station (ss12), a bench and a shop. When you are finished, return to the previous room and head up the stairs to the left. Enter the door at the top for a power node (11) and a text log (Log 14 - Two Tines).
Backtrack all the way to the starting room and this time head through the right hand door. As with the previous room that was laid out identically, turn immediately to the left and enter the door here to find an audio log (Log 15- Harsh Pressure). Exit to the previous room and follow your suit locator up the stairs.
At the top of the stairs, turn left and go through the unlocked door, continue around the circular balcony killing the infector and the slasher as you go.
Continue down the stairs at the end of the balcony and defeat the two slashers and the infector at the bottom. Explore the bottom area a little further and another three slashers, an infector and a spitter will appear. Retreat back to the stairs and kill them off as they come to get you. Once the room is clear of baddies, enter the cargo lift on the ground floor here and activate it.
Follow the walkway to the door and head down the hallway to the right. Shoot the glowing purple fuse box on the wall and enter the door to the right of it. This will give you easy access and a faster route back to the save point if you wish to do so. Follow the suit locator back to the previous door and enter.
Go through the door to the right of the TV. Once inside, look near the window to the outside, on the floor nearby you will spot a text log (Log 16 -Recruit test Results). Turn around and pull the panels off the wall with kinesis. You will notice that there is an empty slot above the blue screen here. Look to the right of the dead body in the chair nearby to see another kinesis panel on the wall. Remove this, and pull the fuse out of that slot.Place the fuse into the empty slot above the blue screen to open the door in the previous room.
Return to the previous room. Note once again the weak glass wall at the far side. As you move into the room, a group of three slashers will attack. Again, use the window to create a vacuum to get rid of all the necromorphs in the room and then shoot the red switch to close the door before you suffer the same fate. Mop up any remaining survivors.
Now you will notice the door we just opened is somewhat faulty, don't bother trying to go through it, you won't be very successful. Instead, use stasis on it to slow it down and run into the next room when it is safe to do so. Inside you will find a save station (ss13) and in the next room you will find a Schematic (Schematic 5 - Security Suit) on a shelf opposite the vent to the next area. Once you are ready to go, enter the vent.
Upon exiting the vent, prepare to button mash the button that appears on the screen. Once Isaac calms down, pick up the power node (12) off the desk infront of him and continue through the door to the left.
Again you can shoot the purple fuse box on the wall near the door to the left for easy access to the previous save point if you wish. When you are ready, continue down the hall to the right. Enter the door here and follow the walkway around to the right. Take the lift down to the lower level. Take the passage around to the left, across the circular room and up the stairs to the door. The door will subsequently be broken.
Retreat to the circular room and all the gates around the sides will drop open and a new form of necromorph will introduce itself - the stalker. Stalkers hide behind objects and stick their heads out from time to time and when they get a clear line on you they will charge out of cover at high speed to attack you. A couple of shots to the legs will get rid of them, but this area is very open and has lots of small passages the stalkers can use to sneak up on you, so keep track of your surroundings! Retreat back to the broken door so that the stalkers will have to charge at you in the open for a good distance before they reach you.
Note: Defeating all the stalkers here will reward you with the achievement/trophy 'Clever Girls'.
Once the four stalkers have been defeated follow your suit locator to a blue panel that Isaac can hack. Let him do so. Use the now active elevator to access the next level and as you get off, turn to the left. Under the body here you will find a power node (13). Continue to follow the balcony to the right.
Enter the door here and follow the hallway to the end. Shoot the purple fuse box next to the door to the left. This will once again provide quick access to the save point near the start of the level, when you are ready to progress, continue through the right hand door.
Continue towards the altar at the back of the room and this will trigger some baddies to come and get you. Take care of the two slashers first and then destroy the three groups of swarmers that follow. Once clear, make your way around behind the altar and kill the slasher that is playing dead before entering the lift. Enter the door at the bottom of the stairs to complete the chapter.
