Control Resonant Underpass Fast Travel Doors List, Requirements, and Unlock Steps

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Fast Travel Doors are travel points in the Underpass, a region crossed by suspended concrete blocks, shifting gravity and a cable car. Finding the doors means working through those crossings, even when the next destination is already in sight.

Once available, the doors let you travel between areas, and the travel menu lists destinations throughout the Underpass. Deepest Underpass is normally reached during story progress; this guide covers the six doors in route order without getting into that story.

All 6 Underpass Fast Travel Doors in Control Resonant

The route uses the travel menu to return from Fault to The Spire, so establish door travel before setting out.

The first destination beyond Sinkhole is visible across the cavern. Its position gives you a bearing, but you cannot go straight to its door from this viewpoint.

The cable car crosses the chasm between Research Stations and the route to Deepest Underpass. An operational cable car carries you across the chasm toward Deepest Underpass.

Farther on, the upper route changes gravity. Keep the destination bearing in mind at that transition.

How to find all 6 Underpass Fast Travel Doors in Control Resonant

Start at Sinkhole and follow the connected route through the remaining five doors.

Start at the Sinkhole door

Begin beside the Sinkhole Fast Travel Door in the Underpass courtyard. Approach the door, then face the open stairwell pit.

Follow the lights down

Drop into the pit and use the overhead lights and lanterns to follow the long concrete passage and pick out the descending stairways into the main chasm.

Enter the main cavern

Go up the next concrete stairs and through the lit tunnel to the cavern of suspended blocks. The map still places you near Sinkhole here.

Face The Spire

From the cavern viewpoint, survey the suspended platforms and locate The Spire ahead before moving onto them.

Drop to the lower platform

Step off the ledge onto the red-carpeted platform below, then jump across the concrete blocks toward the yellow-lit ledges.

Cross the first interior

Jump into the red-carpeted room, follow the glowing cables past the desks, and drop through the opening to the lower walkway.

Climb toward the upper chamber

Scale the stacked blocks, cross the suspended mechanical assembly, and enter the higher red-carpeted chamber.

Drop through the square opening

Drop through the square floor opening to the chamber below.

Climb on the new orientation

Scale the high concrete blocks and take the stairs to the exposed rooftop with red carpet.

Reach The Spire door

Approach the Fast Travel Door on the rooftop’s red-carpeted pad and interact with it to reach The Spire.

Leave The Spire for Tubes Island

Face the structure with green and yellow lights, then jump westward across the tall concrete pillars toward Tubes Island, grabbing their ledges as you go.

Follow the orange pipes

Cross the higher platform and the suspended pillars toward the structure with exposed orange pipes.

Reach the Fault door

Jump onto the elevated platform marked by a round red-carpeted circle; the door here is Fault at Tubes Island, a named map landmark. The Underpass Fault lies behind this location.

Return to The Spire

Select The Spire in the Fast Travel menu to return to its door. You can also backtrack by reaching and jumping across the platforms.

Head south from The Spire

Turn from the door and cross the gaps between the concrete pillars in the southern direction.

Scale the high wall

Use the floating blocks and wall ledges to climb up, then jump onto the suspended pipe assembly.

Enter the interior passage

Jump up the red-carpeted stair sections into the opening and continue through the corridors to the concrete rooftop.

Reach Halfway Trail

The Fast Travel Door on this rooftop is Halfway Trail.

Turn toward the far opening

From the Halfway Trail door, turn right and cross the platforms toward the opening in the distant wall.

Climb the orange-trimmed structure

Jump to catch the tall concrete structure, climb it, and enter the interior hall.

Pass through the shifting rooms

Follow the red-tinted corridor as gravity changes, then jump through the square hatch into the next inverted chamber.

Reach the offices and balcony

Leave through the doorway, drop into the lower room, and cross the shifting corridors to the red-carpeted office and open balcony.

Approach the cable car area

Continue beyond the offices and their yellow cables, crossing the concrete ledges and suspended pillars toward the cable car station in the area marked Cable Car on the map. Slide along the cable and drop onto the platform below the car.

Climb above the cable car

Use the suspended pipe platform to gain height, then scale the concrete wall and stacked blocks to the upper rooftop.

Reach Research Stations

The rooftop Fast Travel Door is Research Stations.

Retrieve the cable car

Cross the rooftop, drop to the platform below, and press the yellow call button to bring the car along the wire.

Cross the chasm

Board the yellow car, operate its control lever, and ride to the arrival station.

Enter the mossy cavern

Exit the car, jump across the pipes and concrete blocks, and pass through the doorway overlooking teal-green moss and orange fluid.

Reach the cavern floor

Descend across the moss-covered pillars, then follow the green-lined passage into the open chamber.

Get past the guard

Deal with the moss-covered guard in the chamber; melee attacks are one way through this encounter.

Head toward the red section

Beyond the chamber, head toward the red section before taking the upper route.

Climb into the red duct

Cross the mossy floor, step onto the brown crate, and enter the red wall duct leading to the office hall.

Take the upper route

Cross the office to the far wall and climb its mounted panels into the chamber above.

Pass the gravity switch

Move through the inverted upper room, jump through the ceiling opening, and continue through the corridors as their orientation shifts.

Follow the upper passages

Cross the concrete cubes and upper office level, then continue through the corridor with teal and orange pipes and its obstacles.

Reach Deepest Underpass

Jump to the raised platform in the concrete shaft and approach the glowing Deepest Underpass door.

Reach Deepest Underpass | Emmie Jacob Game Guides/YouTube

At Deepest Underpass, the travel interface identifies the final door, and the map shows the connected locations. An unlocked Fast Travel Door lets you travel both to and from its location, giving you a way back across the areas you have reached.

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