TL;DR
- The alien language in Subnautica 2 is called Axum Radial A — the script used by the Axum civilization on Proteus.
- You must first unlock the Axum Vision adaptation by clearing the Alien Ruins Angel Comb.
- After that, scan the Rosetta Stone monolith near the Axum Observatory to fully decode all alien glyphs.
- If you see “Translation Failed” in red, it means you have Axum Vision but have not scanned the Rosetta Stone yet.
- Once both steps are done, you can read alien symbols, use control room terminals, and progress the main story.
Alien Language in Subnautica 2 is not something you automatically understand as you explore. When you first arrive at the Alien Ruins and see glowing yellow glyphs on the walls and terminals, they are completely unreadable. Some players get Axum Vision and still see the message “Translation Failed” in red. That is because learning the alien language in Subnautica 2 is a two-step process — and most guides only cover one half of it. This guide walks you through both steps from start to finish.
What Is the Alien Language in Subnautica 2?
The alien language you encounter in Subnautica 2 is called Axum Radial A. It is a logographic writing system used by the Axum civilization — the beings who built the ruins, the observatory, and the giant turbine structure in the Karakorum region of the planet Proteus. Each glyph in Axum Radial A represents an entire word or concept, not just a letter.
When you first reach the Alien Ruins area, the glyphs are invisible until you unlock Axum Vision. Once you have Axum Vision, the yellow glyphs appear — but they may still say “Translation Failed” when you try to read them. That is the second problem this guide solves.
Why Learning the Alien Language Matters
Without being able to read the alien language, you cannot interact with the control room terminals inside the Alien Ruins. These terminals are needed to activate the alien turbine, which powers the Axum Observatory door. In short, learning the alien language is a required step to finish the current main story in Subnautica 2’s early access build.
Once you can read the glyphs, words like Turn, Electricity, Machine, Control, and Shallow become readable on the terminals — and the turbine puzzle suddenly makes sense.
What You Need Before You Start
Before you can learn the alien language, you need a few things in place:
- Feedback Resonator — Required to clear the Alien Ruins Angel Comb. The basic Sonic Resonator will not work on armored pink Bloom Cankers. See our Feedback Resonator guide for crafting details.
- Tadpole with Depth Module Mk. I — Some of the bloom nodes sit at 300 meters depth. Without this, you cannot reach them. Check our guide on how to go deeper with the Tadpole Depth Module.
- Bioscanner — You will need this to scan the Rosetta Stone and complete the language unlock. See our Bioscanner guide if you do not have one yet.
If you are still early in the game, check our best early upgrades and progression path guide to get your gear ready before attempting this area.
Step 1 – Unlock Axum Vision (Clear the Alien Ruins Angel Comb)
Axum Vision is the adaptation that makes the alien glyphs visible in the first place. Without it, you simply cannot see them on the walls and terminals. You unlock Axum Vision by clearing the Alien Ruins Angel Comb — the pink Angel Comb located beneath the giant turbine structure in the Karakorum region, roughly 1,100 to 1,300 meters east of your Lifepod.
This is a multi-step process on its own. Here is a quick summary of what it involves:
- Clear three outer Bloom Nodes (Western, Southern, and Eastern) using the Feedback Resonator.
- Return to the main Angel Comb once all three are cleared.
- Destroy the final two cankers on the Angel Comb’s own tendrils.
- Interact with the pink glowing center (Gene Donor) to receive Axum Vision.
For the full walkthrough on this, read our dedicated Alien Ruins Angel Comb guide. It covers every bloom node location, the canker mechanics, and why the Feedback Resonator is the only tool that works here.
Once you interact with the Gene Donor, Axum Vision is permanently granted. You will immediately start seeing yellow glyphs on alien structures around the Alien Ruins. However, if you try to hover over them at this point, you may see “Translation Failed” in red — which brings us to Step 2.
Step 2 – Scan the Rosetta Stone
The Rosetta Stone in Subnautica 2 is a tall, black-and-green titanium alloy monolith located near the Axum Observatory. It is roughly 1,000 meters east of your Lifepod, just outside the alien observatory tower that breaks the ocean surface in the Karakorum region.
The monolith has seven panels. Each panel shows the same message written twice — once in Architect Linear (a language already known to Alterra intelligences from prior contact on planet 4546B) and once in Axum Radial A (the alien language you are trying to learn). Because your scanner already knows Architect Linear, it can cross-reference the two scripts and decode the alien glyphs like a cipher.
Scanning the Rosetta Stone unlocks the Axum Glyph databank entry and decodes all 85 Axum logograms in one go. After this, every alien glyph you hover over will become fully readable.
How to Find the Rosetta Stone
Follow these steps to reach it:
- From your Lifepod, head east following the E marker on your compass.
- Travel approximately 1,000 meters. The Axum Observatory tower is visible above the water surface — it is a hard-to-miss alien structure that breaches the ocean.
- Swim toward the base of the observatory tower. The Rosetta Stone monolith is a short swim away from the base, sitting on a limestone platform above water-carved alcoves.
- Pull out your Bioscanner and scan the monolith. The scan completes instantly and permanently unlocks the full Axum language translation.
You can also find the Rosetta Stone using your Signals tab in inventory — look for the Alien Ruins or Observatory marker and navigate from there. The monolith is about 273 meters from the Alien Ruins at a bearing of 195 degrees south-southwest.
Important: Hug the sea floor as you travel east toward the observatory. There are Leviathan-class predators patrolling the open water above, and staying low reduces how often they notice you. Having the Tadpole with you makes the trip significantly safer and faster.
What Happens After You Learn the Alien Language
Once you have both Axum Vision and the Rosetta Stone scan, the alien language is fully readable. Here is what this unlocks:
- All yellow alien glyphs throughout the Alien Ruins biome become readable — words like Turn, Electricity, Machine, Control, and Shallow are now visible on the walls and terminals.
- You can interact with the Axum Polarized Screens in the Upper and Lower Generator Control Rooms of the Karakorum Power Plant.
- The turbine activation puzzle becomes solvable — the control room terminals respond to input once you can read what they say.
- After powering the turbine, you can interact with the Axum Observatory door and enter the inner chamber.
- Inside the observatory, you can scan an Orrery for additional PDA lore about the Axum planetary system.
Learning the alien language is effectively the key that opens the entire late-game story content currently available in Subnautica 2’s early access build.
Fixing “Translation Failed” in Subnautica 2
A lot of players reach the Alien Ruins, unlock Axum Vision, and then see “Translation Failed” in red every time they hover over a glyph. This is one of the most commonly reported points of confusion in the game right now.
The fix is simple: scan the Rosetta Stone. Axum Vision makes the glyphs visible, but it does not teach you what they mean. The Rosetta Stone is what gives your scanner the actual translation key. You need both.
If you have already done both steps and are still seeing “Translation Failed,” check whether your Bioscanner scan actually completed. The monolith needs a full scan — do not swim away mid-scan. Once it completes, the Axum Glyph databank entry will appear in your PDA, confirming the language has been decoded.
Lore: What the Alien Language Says
The Rosetta Stone’s inscription provides real in-game lore, not just a tutorial mechanic. The text explains that the Axum beings — the native intelligent life on Proteus — previously made contact with the Architects, the same alien civilization encountered in the original Subnautica on planet 4546B. The Axum built the Rosetta Stone themselves, deliberately creating a bilingual document to help any beings who arrived with Architect knowledge decode their own language. In other words, they expected someone like you to show up eventually.
This lore connects Subnautica 2’s story directly to the broader universe of the series and explains why Alterra intelligences already have Architect Linear in their databases.
Tips for This Part of the Game
- Do both steps in one trip if you can. The Alien Ruins and the Axum Observatory are close to each other in the same region. After clearing the Angel Comb, swim to the Rosetta Stone before heading back to base.
- Stock up on oxygen and batteries before heading east. This is a long swim with several stops. Check our guides on how to increase oxygen and how to recharge tools and batteries before you go.
- Bring the Tadpole. The eastern route toward the Alien Ruins and Observatory has Leviathan-class enemies. The Tadpole gives you speed and escape options that swimming alone does not.
- The Rosetta Stone scan is permanent. You only need to do it once. After scanning, all 85 Axum logograms are decoded forever across your save file.
- Axum Vision glyphs appear in yellow. If you are in the Alien Ruins and do not see yellow markings anywhere, double-check that you fully interacted with the Angel Comb Gene Donor. The adaptation is only granted after the interaction completes, not just after destroying the cankers.
For more on managing your character through this part of the game, our guides on how to increase inventory space and how to get the Heat Tolerance trait are useful for surviving the deeper areas around the Karakorum region.
Where the Alien Language Fits in the Subnautica 2 Story
Subnautica 2 is built around the idea that you adapt your body and your knowledge to survive an alien planet. Learning the alien language is one of the most story-meaningful moments in the game — it is the point where the planet stops being a mystery you are surviving and starts becoming a civilization you are uncovering. The Axum beings left their language behind deliberately, and your character piecing it together through the Rosetta Stone is a quiet but significant moment in the game’s narrative.
The Alien Ruins, the turbine puzzle, the Observatory, and the alien language are all part of the same story arc — and it currently represents the furthest point of story content available in the early access version of the game, which you can play right now on Xbox Game Preview or via Steam.
Cool alien-language explainer. While chasing the prereq scan tablets across biomes I lean on Subnautica 2 Map to confirm coordinate locations and adjacent supply crates: https://subnautica2map.com/