You will need three stone tablets for this.
Choose the eastern door on the higher level of the main hall.
They lead to a narrow corridor with stairs(M2,11).
Go to the eastern room when you’ve defeated mutant insects and found the grenade launcher(M2,12).
In the next corridor(M2,27)there is a leech zombie behind the corner.
They lead to Broadcast Room.
After going in, head right and defeat another leech zombie.
you’ve got the option to now explore the room to findVise Handle.
Return to the corridor and continue walking.
Open another door leading to a bar(M2,29).
Besides some supplies, there is also a piano here.
make a run at interact with it asRebeccaand you will earn an achievement/trophy.
Switch toBillyand play the right melody on the piano.
You will unlock a secret passage.
Order the partner not to follow you and switch toRebecca.
Enter the secret room, approach the rig on the wall and pull out theBattery.
Doing this will lead to closing the exit.
No need to panic, you just need to switch toBillyand play the piano again.
Exit the bar and approach the next door.
Get rid of the zombies and locate the vise shown in the screen above.
pick the character who has the Vise Handle and use it on the vise.
You will unlock Obedience Tablet, which you should take.
Quickly use the grenade launcher to eliminate the monster.
Using this door will take you out of the building(M2,33).
Head right and you will find a broken elevator.
snag the character who has the Batter, approach the slot on the wall and place the object there.
you could now interact with the elevator mechanism to use it.
You will find a large crate inside the elevator.
Turn 180 degrees around and push the crate out of the elevator.
Now start pushing the crate left and then towards the bottom of the screen.
You should move the crate to the column shown in the screen above.
Climb on top of the crate and collectDiscipline Tabletfrom the column.
Now we can proceed to the puzzle in the observatory.
For the start, go inside the building again(M2,3).
Go up the stairs to level 3F where you fought Centurion(M2,10).
No matter what you choose to do, take the northern door (between the two standing armors).
Using the door will take you to the observatory(M2,34).
Go across the balcony and locate the ladder leading to a higher level(M2,35).
Find a panel with three slots.
Placing all three tablets in the right place will trigger a cut-scene.
Go back up and use the door to go to the next location - Laboratory.
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