Quick Answer
- Finish Source Of The Contamination to unlock the quest.
- Switch the Spaceport map to its underground tunnel layer.
- Use the large collapsed-concrete entrance near the Launch Towers.
- Find the red valve on a pipe along the right-hand wall and turn it.
- Complete both objectives in one round; extraction is not required.
How to Unlock Switching the Supply
Unlock Switching the Supply by completing Source Of The Contamination. It is part of Celeste's sequential water-contamination chain: Water Troubles, Source Of The Contamination, Switching the Supply, then A Warm Place to Rest.
If Celeste is not offering Switching the Supply, finish the earlier chain step first.
Switching the Supply Requirements
You only need the prerequisite quest completed and access to Spaceport. Nothing has to be carried in or extracted, so a low-cost loadout works well.
- Complete Source Of The Contamination.
- Deploy to Spaceport.
- Plan for exposed sight lines on the approach to the Launch Towers and poor visibility inside the tunnels.
How to See the Spaceport Tunnels on Your Map
Switch the Spaceport map to its underground layer to reveal the tunnel network around the base of the Launch Towers. The tunnel system has several entrances, so using the layer view saves you from searching for passages that are hidden on the normal surface map.
Where to Enter the Tunnels Under the Spaceport
Use the large ground opening near the Launch Towers where collapsed concrete forms ramps into the maintenance tunnels. Other entrances exist, but this one keeps the route to the quest valve short.
- Move toward the Launch Towers in central Spaceport.
- Find the large collapsed-concrete opening near the tower base.
- Descend the broken ramps into the tunnel network.
- Use the underground map layer to confirm you entered the correct tunnel branch.
The Clean Dream also uses this tunnel area, so the objectives can be combined on the same Spaceport trip.
Where to Find the Valve
The quest valve is a red wheel on a pipe along the right-hand wall inside the tunnels, close to the recommended Launch Towers entrance.
- Enter through the collapsed-concrete opening near the Launch Towers.
- Follow the nearby tunnel branch rather than walking deep around the full underground loop.
- Keep the right-hand wall in view and look for a red valve mounted on the pipework.
- Interact with the valve to register the quest objective.
Once the valve turn registers, extraction is not required.
Switching the Supply Rewards
| Reward | Type | Note |
|---|---|---|
| Quest completion rewards | Quest reward | Check the in-game reward panel when turning in the quest for the current reward set. |
What Comes After Switching the Supply
Completing Switching the Supply unlocks A Warm Place to Rest, the next step in Celeste's water-contamination chain.
Frequently Asked Questions
How do you unlock Switching the Supply?
Complete Source Of The Contamination. Switching the Supply is the next step before A Warm Place to Rest.
How do you see the Spaceport tunnels on the map?
Use the map layer control to switch from the surface view to the underground tunnel layer around the Launch Towers.
Where is the valve in Switching the Supply?
It is a red valve on a pipe along the right-hand wall inside the maintenance tunnels near the recommended Launch Towers entrance.
Do you need to extract to complete Switching the Supply?
No. The quest registers when you turn the valve, although both objectives need to be completed in the same round.
Which entrance is closest to the valve?
Use the large collapsed-concrete opening near the Launch Towers. Other tunnel entrances exist, but this one is the most direct for the valve.