Long read: What might the ultimate character creator look like?

Baldur's Gate 3, Street Fighter and Lost Ark developers discuss.

If you click on a link and make a purchase we may receive a small commission. Read our editorial policy.

Control - Threshold mission: Turbine Room puzzle solution and Oceanview Motel puzzle solution

The beginning of your quest through Black Rock Processing.

After discovering that the HRA Lab has run out of Black Rock at the end of Old Boy's Club, Marshall has sent you to search for more in exchange for information about Dylan.

Threshold, the fifth main mission in Control, sees you return to the Maintenance Sector and discover what lies in its darkest depths. First, however, you've got a couple of puzzles to solve and an old motel to visit.

On this page:

Need more help in your quest through the Oldest House? Then check out our Control walkthrough hub, with links to all our Control guides.

Cover image for YouTube video13 Ways Control Gameplay Connects To Alan Wake - CONTROL + ALAN WAKE EASTER EGGS!
13 Ways Control Gameplay Connects To Alan Wake - Control + Alan Wake Easter Eggs!

Search for Black Rock Processing in Control

Marshall will open up a doorway, allowing you to head back to Central Research and to the Sector Elevator.

You can take this time to head back up to Central Executive to upgrade your Abilities and talk to Emily to learn more about the Bureau of Control.

There is also a new Weapon Form available, Pierce, which is perfect for destroying armoured enemies.

When you're ready take the Sector Elevator down to the Maintenance Sector.

You'll find yourself in Central Maintenance. Head through the door on your left marked Black Rock Processing.

This will lead to a room with two metal detectors in and a small, glassed, observation room. Defeat the Hiss guard waiting for you and, if you haven't done so already, head into the observation room and collect Research & Records - Research - Home Safe Tests. This will allow you to start the A Good Defence side mission.

When you're ready, go through the door in the top-left hand corner of the room signposted as the Turbine Room.

Collectables to be found:

  • Research & Records - Research - Thresholds
    • (Beneath the statue in Central Maintenance.)
  • Correspondence - Non-Official - Tennyson Report Warning
    • (In the room with the metal detectors sign posted as Black Rock Processing after Central Maintenance.)
  • Research & Records - Research - Home Safe Tests
    • (In the same room you reach via Central Maintenance - found opposite the metal detectors. Finding this document will also start the A Good Defence mission.)
The locations of the collectables - Thresholds, Tennyson Report Warning and Home Safe Tests.

How to solve the Turbine Room puzzle in Control

In the Turbine Room, you'll discover that the titular turbines are running a little bit out of control. If you head down the stairs to your left, you'll find a chest.

First, you want to remove the electricity box from the socket on the left hand wall. This will stop the first set of turbines from moving, allowing you to cross to the other side of the room. Make sure you can an electricity box with you, because you're going to need it in a minute.

If you want you can place on the electricity socket directly opposite the first set of turbines.

Once you're on the other side of the room, head up the stairs to reach the next set of turbines. Again, remove the already placed electricity box. This time, however, place it on one of the electricity boxes on the opposite side of the room.

Now go and retrieve another electricity box to place on the second socket to open the door.

Jump across the turbines and head through the door to find a platform overlooking the bottomless black void that every government building has.

Pretty standard feature for all office buildings these days.

If you take the right hand passageway, you'll come to a hole in the floor that return you to the room with the metal detectors in.

You, however, want to pull the light switch three times, which is apparently just hanging there, to return to the Oceanview Motel.

How to complete the Oceanview Motel puzzle in Control

You're back in the Oceanview Motel and, like before, you need to go ring the bell at the front desk.

Ring the bell until two of the rooms in the right hand corridor are open - rooms 222 and 224.

In room 224, you can move certain objects around. Your goal is make room 224 a mirror of room 222. To do this you must make sure that:

  • The picture is hanging straight
  • The radio is on the right-hand side of the window sill
  • The chair is pulled out from under the desk
  • The plant is on the left-hand side of the chest of draws
This is how room 224 should look.

Once you've done this correctly, you'll hear an ominous tone.

The door to room 226 will now be open, allowing you to collect the key from inside.

Head to the opposite corridor and open the door with the black pyramid on it. Pull the light switch three times to return you to the Bureau of Control.

Continue towards Black Rock Processing in Control

You'll see that your time in the Oceanview Motel has built a bridge from one side of the bottomless void to the other.

Head back to the room with the metal detectors in either via the Turbine room or by jumping down the hole at the end of the left-hand passageway.

Go through the giant stone doors, cross the bridge and go through the next set of giant doors.

You'll reach the doors to Black Rock Processing, but they are, of course, locked.

If you want the chest and collectable in the windowed room, which is just after the stone doors, use Launch to throw a nearby bench through the window to break the glass.

Smash the glass to access the room.

When you're ready, head up the stairs to the left of the locked door, through the short corridor on the right-hand side and jump down into the office below.

This will take you to the other side of the locked door and into the Atlas Chamber.

You've managed to bypass the locked door.

Upon arrival, you'll hear the sound of gunfire. Make your way towards this noise by leaving the office and heading up the stairs. Don't forget to unlock the door you just bypassed along the way.

You'll find a group of Bureau employees under attack from the Hiss, including a Hiss Warped. Kill the Hiss and save their lives.

Once the Hiss are defeated, cleanse the Control Point.

If you want to grab a quick collectable and open a chest, head up the stairs to the upper left-hand side of the room. You'll find them, along with another shelter, up here.

Collectables to be found:

  • Research & Records - Research - Atlas Theory
    • (On the cabinet in front of the doors to the Atlas Chamber.)
  • Multimedia - FBC Recordings - FBC Reminder: Altered Workspace
    • (In the windowed room just after the stone bridge to Black Rock Processing - use Launch to break the glass and gain entrance.)
  • Multimedia - Darling Presentation - Oceanview Motel and Casino
    • (Take the left-hand stairs in the room with the Control Point for the Atlas Chamber and to find this collectable in the board room on this level.)
The locations of the collectables - Atlas Theory, FBC Reminder: Altered Workspace and Oceanview Motel and Casino.

It’s time to journey into the mysterious Federal Bureau of Control. Our Control walkthrough can help you through the storyline missions, including Welcome to the Oldest House, Unknown Caller, Directorial Override, Old Boy’s Club, Threshold, My Brother's Keeper, The Face of the Enemy, Finnish Tango, Polaris and Take Control. You can also learn new supernatural powers by completing A Merry Chase, A Good Defence and A Captive Audience. We also have guides on upgrading the Service Weapon, your Abilities, how to use Weapon and Personal Mods, how to unlock every outfit and the solution to the Roulette Wheel puzzle.

Speak to Arish in Control

After cleansing the Control Point, Arish will ask you to come and talk to him. Head up the stairs on the left-hand side of the room and then head left to reach him.

He'll tell you about a monster in Black Rock Processing. You better go deal with that and find Dr. Darling's Black Rock Lab.

Collectables to be found:

  • Multimedia - FBC Recordings - Expedition Debrief
    • (On the desk along the back floor in the same room as Arish)
  • Correspondence - Official - Marshall: Trench's Behaviour
    • (On the desk in the middle of the room Arish is in.)
The location of the collectables - Expedition Debrief and Marshall: Trench's Behaviour.

Your next step in Control, sees you tracking down another of Dr. Darling's labs - this time it's his Black Rock Lab.

From Assassin's Creed to Zoo Tycoon, we welcome all gamers

Eurogamer welcomes videogamers of all types, so sign in and join our community!

In this article


PS4, Xbox One, PC

Related topics
About the Author
Lottie Lynn avatar

Lottie Lynn

Guides Editor

Lottie Lynn is Eurogamer's Guides Editor. She likes exploring new games and still has nightmares about the moon from Majora's Mask.