Quick answer
To open the Observatory, current guides say you must clear the Alien Ruins Angel Comb for Axum Vision, scan the damaged turbine with the Bioscanner, repair it with the Habitat Builder, then restart the Power Plant from the generator controls. PC Gamer and Subnautica 2 Guide list the repair cost as 10 Titanium Ingots, 10 Mangalloy Ingots, and 10 Strontium. PC Gamer breaks the raw processing burden down to 60 Titanium, 20 Celestine, 10 Atacamite, and 10 Troilite, so bring a haul plan before you leave base.
Field notes for the Observatory push
The repair is a logistics problem
The hard part is not understanding the steps. It is moving a large processed-material stack without forgetting the scan, the builder, or the restart controls.
Do not start hauling before Axum Vision
If the glyphs and screens are still unreadable, the repair pile is premature. Finish the adaptation route first so the Power Plant trip has a clear ending.
Stage processed materials by type
Titanium Ingots, Mangalloy Ingots, and Strontium should sit in a named repair box. Mixing raw and processed pieces makes the final count feel worse.
Power Plant repair route
Clear Angel Comb before touching the turbine
PC Gamer starts the route by clearing the Angel Comb in the Alien Ruins and getting Axum Vision. Subnautica 2 Guide also says Axum Vision is required before you can work with the Axum consoles. If you skip this, the rest of the route stalls.
Bring depth, oxygen, and the right tools
This is not an early swim. Current guides call out Tadpole Depth Module, Bioscanner, Habitat Builder, and a stable oxygen setup. A Beacon at the Power Plant and another near the exit saves a lot of second-guessing.
Scan the damaged turbine
The damaged turbine sits on the large circular structure above the Angel Comb. PC Gamer notes that you scan the broken turbine first; Subnautica 2 Guide says the damaged section must be scanned with a Bioscanner before repair.
Prepare the repair materials as one haul
The repair is heavy: 10 Titanium Ingots, 10 Mangalloy Ingots, and 10 Strontium. PC Gamer turns that into 60 Titanium, 20 Celestine, 10 Atacamite, and 10 Troilite after processing. If your storage is messy, this step will punish you.
Repair with the Habitat Builder, not the Repair Tool
This part is easy to misread. Subnautica 2 Guide and Gaming ProMax describe the turbine repair as a Habitat Builder construction job. Treat it like building a facility section, then move to the control rooms.
Restart the generator controls
Subnautica 2 Guide describes Lower and Upper Generator Control rooms around the Root Canyon and Power Plant wall. PC Gamer says to interact with the alien consoles, dials, and sliders until the controls turn green, then activate the central console.
Open the Observatory after power returns
Once the turbine is repaired and the Power Plant is running, the surrounding facility powers up and the Observatory door opens. If the door still refuses you, assume one control-room step or language/adaptation requirement is unfinished.
Observatory unlock card
Adapt
Axum
Clear Angel Comb and use Axum Vision for consoles.
Repair
30
10 Titanium Ingots, 10 Mangalloy Ingots, 10 Strontium.
Open
Door
Generator controls power the Observatory path.
Repair material checklist
| Need | Planning note |
|---|---|
| Axum Vision | Get it from the Angel Comb route before console work. |
| Bioscanner | Used to scan the broken turbine and reveal repair. |
| Habitat Builder | The tool used to build the turbine repair. |
| Tadpole Depth Module | Needed for a sane trip into the Power Plant region. |
| 10 Titanium Ingots | Part of the turbine repair cost. |
| 10 Mangalloy Ingots | Requires Titanium Ingots, Atacamite, and Troilite. |
| 10 Strontium | Processed from Celestine according to current repair math. |
| Cargo space | PC Gamer suggests a haul setup or roughly 30 open slots. |
The material bill is the real gate
Do not arrive with half the ingots and good intentions. Stage the materials at base or in a forward locker, keep at least one Troilite protected for Metal Farm planning, and only make the final run when the full repair cost is packed.
FAQ
How do you open the Observatory in Subnautica 2?
Clear the Angel Comb for Axum Vision, scan the damaged turbine with the Bioscanner, repair it with the Habitat Builder, complete the generator controls, and return after the Power Plant powers up.
What materials repair the Power Plant turbine?
Current PC Gamer and Subnautica 2 Guide data lists 10 Titanium Ingots, 10 Mangalloy Ingots, and 10 Strontium.
Do you use the Repair Tool on the turbine?
No. The current walkthroughs describe this as a Habitat Builder repair/build action after scanning the damaged turbine section.
Why is the Observatory door still closed?
Most likely a prerequisite is missing: Axum Vision, alien-language progress, the Bioscanner turbine scan, one generator-control interaction, or the final central console activation.