CONTROL Resonant Maintenance Protocol — All Bulbs & Coverall

PowerPyx-Aligned Updated Oct 22, 2026

Quick answer

Maintenance Protocol is a high-reward side story in CONTROL Resonant initiated from Zoe’s Briefing in Watchtower. To complete the mission, you must travel to the Deepest Underpass, access the hidden Oldest House basement, repair three temperamental light bulbs (Electrosensitive, Volatile, and Botanophobic), and escape a projector slide dimension trap. Completing Maintenance Protocol unlocks the Standard Issue Coverall cosmetic outfit for Dylan Faden.

Developer: Remedy Entertainment · Series Context: Control Resonant (2019/2026) · Official Hub: control-resonant.com.

Locating the Deepest Underpass entrance

The mission entrance is hidden in the southern sector of The Underpass district. Follow these navigation steps to access the Oldest House basement door:

Fast travel to the Deepest Underpass Checkpoint.
Head directly south across the flooded train tracks and climb the high concrete ledge using Dylan’s jump dash.
Look for a heavy blast door marked with Oldest House containment seals.
If prompted by the security keypad, input the Morse code sequence: Short, Short, Long (• • —) to unseal the door.
Clear the Mold growths inside, enter the projector room, watch the film reel, and activate the electrical switchboard (showing three red indicator lights) to mark the bulb locations on your map.

Solving the three temperamental light bulb puzzles

1. Electrosensitive Bulb (Research Stations)

Located directly underneath the Research Stations Fast Travel Point in central Underpass.

Puzzle Condition: The bulb is overwhelmed by electrical charges from nearby power cores.
Solution: Pick up all 3 active electrical Charges off the metal cores immediately adjacent to the bulb housing. Deposit them onto lower or west power cores located further down the corridor. Once the electrical field clears, approach the bulb and select Repair.

2. Volatile Bulb (Halfway Trail)

Located in a secluded cave east of Halfway Trail.

Puzzle Condition: The bulb is emotional and easily frightened by hostile presence.
Solution: Interact with the bulb and select the dialogue prompt: “You’re okay.” A wave of Hiss minions will immediately spawn to attack the room. Defend the bulb while choosing reassuring dialogue options (“I’ll keep them away from you”). Once all Hiss are eliminated, select “You deserve to be fixed” and complete the repair interaction.

3. Botanophobic Bulb (Research Site Island)

Located on a suspended concrete island north of the main Research Site.

Puzzle Condition: The bulb is terrified of organic plant life and refuses to illuminate while fungal growth is near.
Solution: Use fire abilities (like Ignite or Inferno) or heavy Aberrant melee attacks to destroy all surrounding Mold nodes, spore sacks, and fungal vines within a 20-meter radius. Once all greenery is cleared, interact with the bulb to repair it.

Escaping the Projector Slide Trap

Once all three bulbs display green indicators on your tactical map, return to the projector room in the Deepest Underpass to finalize the protocol:

Approach the central film projector and interact with the glowing light bulb displayed inside the film projection image.
A flash of light will pull Dylan directly inside the black-and-white film slide dimension.
Navigate the surreal monochromatic hallway until you reach the projection screen entity.
When presented with dialogue choices, select the following sequence:
- Choose: “Where are you going?”
- Choose: “Unstable bulb.”
- Choose: “Do you know a way out?”
- Choose: “Break the bulb.”
Dylan will smash the projection lens, shattering the slide dimension and returning to the Oldest House basement.

Mission rewards: Standard Issue Coverall

Completing the projector escape finishes the Maintenance Protocol quest and awards the following items:

Standard Issue Coverall Outfit: Classic FBC maintenance jumpsuit equipped directly from Dylan’s Wardrobe in The Gap.
Large Source Bundle: Currency used for weapon form modifications.
Janitorial Dossier: Collectible lore file detailing Ahti’s basement directives.

FAQ

Can I fail the Volatile Bulb interaction if the bulb takes damage?
If Hiss minions strike the Volatile Bulb directly during the wave defense, it will shatter. However, it will respawn after 10 seconds, allowing you to retry the defense sequence.

Do I need fire abilities to clear the Botanophobic Bulb?
While fire abilities (Ignite or Inferno) clear Mold nodes instantly, standard Aberrant melee strikes can also destroy the fungal vines.

Is Maintenance Protocol required for the Platinum Trophy?
Yes. Completing Maintenance Protocol is required to unlock all outfits for the Wardrobe Master trophy and counts toward total side quest completion.