Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsHead to the central Launch Towers on Spaceport, then look just southwest for a collapsed opening with a concrete slope. Walk down, turn around at the bottom, and continue into the tunnel. If you’re completing Switching the Supply, the yellow-marked valve is a short distance ahead on your right.
Where to find the Spaceport tunnel entrance
- Go to the Launch Towers. They are in the center of the Spaceport map.
- Approach the southwest side. Look for a collapsed opening in the ground near the towers, with a concrete slope descending below the surface.
- Walk down the slope and turn around at the bottom. Continue a short way into the tunnel.
This southwest opening is the documented direct route to the valve for Switching the Supply. The underground passage runs around the base of the Launch Towers and has other access points, but entering elsewhere may mean navigating farther through the network. The route is described in PC Gamer’s Switching the Supply walkthrough (November 11, 2025) and Destructoid’s walkthrough (published November 9 and updated November 10, 2025).
How to find the valve for Switching the Supply
Once you have descended and turned around, proceed into the passage and look to the right for a yellow-marked valve wheel. Interact with it to complete the valve objective. Switching the Supply is a Celeste quest whose objectives are to find the tunnels under Spaceport and turn the valve there. The ARC Raiders Wiki quest page, last edited July 21, 2026, records Celeste’s in-game direction to go to the tunnels beneath Spaceport and reroute the water while avoiding ARC.
If you’re entering for The Clean Dream
The same underground area is used in The Clean Dream. PC Gamer’s The Clean Dream walkthrough, published December 16, 2025, says to search four containers in the tunnels and then interact with the green tank at the Filtration System. It places the system near the entrance and to the right of the Switching the Supply valve, so use the valve landmark to orient yourself if you are doing both quests.
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Using a map to plan the route
A community-made Spaceport interactive map includes an underground-marker layer that can help with planning. It is a community resource, not a developer-issued map; the southwest Launch Towers entrance remains the straightforward route described for reaching the Switching the Supply valve.
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