Strontium is already one of the most valuable materials in Subnautica 2 early access, and it starts with a blue crystal many players will never see unless they push deep into the eastern waters. The recipe for Strontium unlocks the moment a player picks up their first bit of Celestine, and the chain from there is simple: two units of Celestine go into a Processor to make one Strontium.
That matters because two of the early access game’s sturdier upgrades for the Tadpole depend on it. The Strike Armor upgrade costs two Strontium, while the Tadpole Hull Chassis upgrade requires three, which means players need ten Celestine to make both items. It is a late-game material in a game still being built, and that makes every shard worth more than its size suggests.
Celestine is found only in a narrow stretch of the map, starting about 1,500 meters east of the Lifepod in the deep waters near the alien ruins. There, it appears as a wide, squat, light blue crystalline growth on the side of rock walls east of the ruins. Players usually get one or two units each time they mine it, so the trip is not just long but repetitive if they are trying to stockpile enough for Strontium crafting.
A Scanner station can make that grind less blind by searching for Celestine and marking its locations on the HUD. That helps turn a difficult hunt into a route, especially for players who go with a nearly empty inventory so they can bring back as much as possible from each run. The material is easy to miss on the wall, but once found it becomes a steady source of an endgame resource in early access.
The friction is that the recipe opens before most players are ready to use it and the material itself sits far from the starting area, forcing a major dive east just to begin the chain. In practice, Subnautica 2 is asking players to treat a single pickup as a signal: Strontium is not a random reward, but a crafted resource tied to one specific region and to the deeper build path still taking shape.
More materials and crafts are expected to arrive as Subnautica 2 continues through early access, which means Celestine may not stay the only gate to Strontium for long. For now, though, the path is clear enough for anyone willing to travel east, mine carefully and turn a few blue crystals into the upgrades that matter most.
