As you enter, continue past the empty fountain until you reach a locked gate. Look up and to the right to find a hook, so jump up to this and drop down on the other side. Climb the stairs to the top and enter the door here.
As soon as you are inside, look to the left and check out the open locker there for a Voxophone [1/4].
Proceed past the statue and enter the door opposite the entry. Follow the hall to the right and enter the next door. There are three levers here you can pull if you wish. When you are ready, go around to the back of the room and enter the next door.
In the hallway here, take the first left and enter the door. Inside you will find a Voxophone [2/4] on a desk against the right hand wall.
Loot the rest of the room and then exit back to the hallway. You can explore the rooms on the left and right if you like for a few lootables before going through the door at the end of the hallway.
As you enter the next room, look on the desk directly in front of you for a Voxophone [3/4] . Look around the right hand side of this desk, tucked away behind it is an Infusion Upgrade [1/1].
Head down the stairs and across the room. Enter the elevator on the far side and hit the switch to take it up to the next area.
As you get off the lift and hit the lever in front to have a look into the room beyond. Continue down the hallway to the left. Activate the Specimen Tracker on the wall here. This will open the door to the left. Follow the wooden walkway around until you find the next door. Hit the lever in here for a scene. Afterwards, head through the now open door on your left.
Again activate the Specimen Tracker on the wall here. This will open the door to the left. Follow the wooden walkway around until you find the next door. Once again, hit the lever for a scene. Once the story sequence is done, the door to the left will open. Go through here and go through the next door that opens. Climb the ramp outside and take the next set of stairs up to the next observation area.
Grab the Voxophone [4/4] from the chair on the right.
When you are done, hit the lever to observe the specimen. Enter the door to the left and activate the Specimen Tracker to open the next door. Open the door at the end of the hallway.
We are now outside! Follow the platform to the right until you find another door. Enter this and follow the hallway until a scene plays.
Once the scene is done, follow Elizabeth through the door and down the stairs. Continue along the set path after her until you reach the elevator. After another short scene, the lift will disappear. Jump through the gap and climb the set of stairs in the next room all the way to the top. Interact with the door here.
Once back outside, follow the ramp to the right all the way to the top until a scene plays.
When you regain control, DeWitt will be in another short flashback type sequence again and you’ll find yourself in another area. Simply walk up to the door at the far end of the room and open it. This will end the chapter.