Unknown Worlds returns to its breakout franchise with Subnautica 2 entering Xbox Game Preview on May 14, 2026 — five years after the studio first teased a follow-up. The release lands day-one on Xbox Game Pass Ultimate and PC Game Pass on Cloud, Xbox Series X|S, handheld, and PC, with Steam Early Access on the same day.
The headline addition is four-player online co-op. The original Subnautica’s solo-only design was a deliberate creative choice — the alien dread of an empty ocean was the point — so Unknown Worlds is treating co-op as an opt-in layer rather than a replacement. Solo play remains the default.
The setting is a new alien planet rather than a return to 4546B. The studio has shown off a deeper biome, three new submersible classes, and procedurally seeded resource nodes that change between runs to keep base-building runs from feeling identical. Crafting, scanning, and oxygen management remain the loop.
Game Preview is Microsoft’s branding for what the rest of the industry calls Early Access. Expect rough edges, missing biomes, and balance changes through 1.0 — Unknown Worlds shipped the first Subnautica that way and it paid off, but the studio has been clear that Subnautica 2 will spend at least a year in preview before a full launch.
