What to know
- Marsh Gas Mk 1 Tower unlocks after progressing the main story into the Wuling zone.
- New Towers become available after collecting the Protocol Datalogger in Wuling.
- This unlock is progression-gated, so it won’t appear early if Wuling hasn’t been reached yet.
- Arknights: Endfield is an action RPG with factory simulation elements by Hypergryph (published by Hypergryph/Gryphline).
In Arknights: Endfield, after the Wuling zone is reached, the key requirement is obtaining the Protocol Datalogger there, which triggers new Tower unlock availability.
Reference table
| Requirement | Where it happens | What it affects |
|---|---|---|
| Main story progression | Wuling zone | Enables the Wuling progression gate for Tower unlocks |
| Protocol Datalogger collected | Wuling | Unlocks access to new Towers (includes Marsh Gas Mk 1 Tower) |
What “unlocking new Towers” means here
This unlock is tied to progression rather than a standalone puzzle or optional objective. Once the Protocol Datalogger in Wuling is collected, new Tower options become available, and Marsh Gas Mk 1 Tower is part of that set.
If Marsh Gas Mk 1 Tower isn’t visible yet, it usually comes down to one of two things: Wuling hasn’t been reached through the main story, or the Protocol Datalogger in Wuling hasn’t been collected yet. After both are done, the Tower unlocks should appear as available.
How to unlock Marsh Gas Mk I Tower
Step 1
Continue story objectives until the Wuling region is reached.
Step 2
Access the AIC Planning Interface where building unlock nodes are researched.
Step 3
In the planning interface, go to the Combat tree and locate the Wuling I tier.
Step 4
Spend 1 Index Point to unlock the Marsh Gas Mk I node so it becomes buildable.
Step 5
Prepare Steel Part ×20, then place the 2×2 Marsh Gas Mk I building.
How to make the unlock appear reliably
Even when the requirements are met, it helps to treat the unlock like a checklist trigger:
- Confirm story progress has transitioned into Wuling content.
- Confirm the Protocol Datalogger in Wuling has been collected (this is the explicit unlock trigger for new Towers).
- Re-check the place where Towers are surfaced/unlocked after the Datalogger is obtained.
Closing notes on Marsh Gas Mk 1 Tower unlock
Marsh Gas Mk 1 Tower is unlocked by story progression into Wuling and then collecting the Protocol Datalogger there, which opens up new Towers.
