Quick answer
Look for Celestine around the deeper Alien Ruins biome, including rocky walls and routes near Needler patrols. Bring the Tadpole, enough depth margin, and the Sonic Resonator for large nodes. Feedback Resonator currently needs 2x Strontium, which means at least 4x Celestine before you count any extra stock.
Field notes for Celestine runs
The material is tied to danger, not rarity alone
Celestine is memorable because the route asks for depth, Alien Ruins navigation, and Needler awareness. Bring the kit for the place, not just the recipe.
Count Strontium before you leave
If Feedback Resonator needs two Strontium, the Celestine count starts at four. Anything below that is a scouting trip, not the upgrade route.
Use the Tadpole like a base camp
Park where the return line is obvious, unload extra stock when you can, and avoid turning a material pickup into a maze problem.
Celestine route plan
Use Alien Ruins as the route anchor
PC Gamer points players toward the Alien Ruins biome and a route southeast of the Alien Ruins Research Base. Use the base, cliffs, and alien structures as landmarks instead of trying to sweep open water.
Watch the lower rock faces
Current guides describe Celestine as a blue mineral vein found on deeper rocks and cave walls. It is easy to miss if you only scan the sea floor.
Bring the Sonic Resonator
Large Celestine deposits need the Sonic Resonator. If you reach the vein and cannot mine it, stop blaming the route. You came without the tool that turns the route into a haul.
Respect Needler patrols
Several current guides warn about Needlers around the good Celestine route. Park the Tadpole with an exit angle, mine quickly, and do not hang around counting inventory while something is chewing the hull.
Process later, not in the water
Celestine is the raw material. Strontium is made later at the Processor, so keep the two names separate when checking upgrade recipes. For Feedback Resonator alone, reserve 4x Celestine for 2x Strontium.
Mining card
Find
Blue veins
Search lower rocks around Alien Ruins, not just the flat floor.
Mine
Sonic
Use Sonic Resonator on large deposits.
Refine
4x -> 2x
Four Celestine makes the two Strontium needed for Feedback Resonator.
Before the Celestine run
| Check | Why it matters |
|---|---|
| Tadpole depth margin | The useful deposits sit past early-water comfort, so the vehicle needs to survive the route calmly. |
| Sonic Resonator | Needed for large Celestine nodes and worth checking before you leave base. |
| Repair and healing | Needlers can turn one greedy mining stop into a damaged vehicle and a bad swim home. |
| Beacon or landmark note | A repeatable route matters more than one lucky blue vein. |
| Processor plan | Celestine becomes Strontium only after base processing; 4x Celestine covers the Feedback Resonator Strontium requirement. |
Do not turn a mining trip into a tour
Celestine routes sit near other tempting materials. That is useful later, but on the first run it is a trap. Mine the blue veins, mark what you see, and leave with the Tadpole intact.
FAQ
Where do you find Celestine in Subnautica 2?
Current guides point to the deeper Alien Ruins biome, including routes southeast of the Alien Ruins Research Base, rocky walls, and lower cave faces.
What does Celestine look like?
Look for blue mineral veins on rock faces. Slow down near cliffs and ledges, because it can blend into deep-water lighting.
Do you need Sonic Resonator to mine Celestine?
Yes for large deposits. Bring the Sonic Resonator before making the deep route.
Is Celestine the same as Strontium?
No. Celestine is the raw mineral. Strontium is the processed material made from Celestine at base.
How much Celestine do I need for Feedback Resonator?
At minimum, bring back 4x Celestine so the Processor can make 2x Strontium. Bring extra if you still need Celestine for Modification Station or Tadpole upgrades.