The game starts off where the last chapter ended, with a cutscene in the research facility.

After the cutscene has ended, you are in the thin hallway where the last chapter ended with the medical drip and bin.
Go straight ahead and you will be in a large area ( much larger than the previous games ) with rooms, hallways and a large 
centre computer with two chairs.

If you walk up to the computer console and interact with it, you will see that it controls the security for the laser shields. There are four shields that need to be disabled. Two of the characters are trapped behind two of the laser shields,
you need to help them out. We need two key-cards to unlock both laser shield.

One of the charcters is trapped behind a laser shield to your right of the main area, and the the other one is in a hallway
guarded by a laser shield to your upper right. Talking with them, they ask you for help, and give you a hint of what to do.

This will be another short walkthru that will just tell you exactly what you have to do to complete it, and does not include all of the other things you can explore.

From the main computer in the large area, turn around and head straight ahead, then take a right turn, head into the first room, the safe in this room is what we need to unlock to get the first key-card. It needs a safe code. You can get a hint where to find it, by interacting with the computer in this room, and reading the unsent email. The email reads that because
the staff keep forgetting the safe code, the person has written in down underneath a bin lid, in the toilets.

So head back out of this room, and take a left. Head up the hallway, and turn left into a room with toilets, urinals and sinks. In between the third large toilet, there is a blue bin. Interact with it and get the safe code.

Head back into the room with the safe, unlock it, and get the contents. This is the healing stones, and keycard A.

Once you have keycard A, go back to the computer console in the main large room. Use it to bring down the laser shield, and let your male friend escape. This also brings down the laser that was blocking your way in the hallways behind the computer room and toilets. So head over to that area, and there is another room behind that area with some drawers in it.

To unlock the drawers, you need a key. Head out of this room, and take a right down the hallway, keep going right until the end. Turn right, and there is an area with two large blue shelves. In the middle of the shelves on the floor, there is a large box. Interact and get the drawers key. Head back down the hallway to the room with the drawers in. Unlock them, and get
key-card B.

Take a left down the corridor, back into the main area, and use the keycard on the computer console. This time you bring down the second barrier and your female friend escapes.

Head to where she was, which is in the corridor opposite the toilets. Keep going down this hallway, and then turn right.
If you try to leave this area, you will be told that you need to find the alien device first. So turn around and go into the room with the computer and safe in it. The safe is already unlocked, so take the alien device and leave the room.

Turn left, and head straight until you come to a door with an exit sign above it. This door is locked and can't be opened.
Take a right and go through the open area, and you will see all three of your friends waiting for you by the last exit.

A cutscene/flashback is played, and a "To be continued..." message is displayed, ending this chapter.