For veteran players, base building was stale. You had the Multipurpose Room and the Observatory. Version 1.21 smashes that limit.

If you last played Subnautica in 2019 or 2020, represents the definitive edition of the game. It strips away the frustration of inventory glitches and ladder bugs, replacing them with the polished "Large Room" architecture that should have been there from day one.

Descend safely, survivors. 🎧🔦

Released on December 8, 2022, this patch was intended as a "thank you" to the community. It integrates several Quality of Life (QoL) features originally prototyped by modders, fixes over 100 persistent bugs, and adds two major new features: the and the Glass Dome .

Alterra systems online. Deploying survival update to all lifepod terminals.

✔️ Habitat Builder UI – less glitch, more glass corridors ✔️ Reapers now respect rock collision (mostly) ✔️ Peeper population rebalanced in Kelp Forest ✔️ Save corruption risk while near Thermal Plant → reduced

Version numbers on consoles (like the PS4/PS5) often differ from the PC's build numbers. The recent "2025 Patch" backported mobile improvements—including controller optimizations and bug fixes—to all platforms. Living Large Update: Some community sources equate 1.21 with the Living Large

For many players on PlayStation 4 and PC, version 1.21 is synonymous with the late 2022 (internally recognized as version 2.0). This was a monumental patch that brought the original 2018 game onto the same engine version as its sequel, Subnautica: Below Zero .

“That’s not a new creature. It’s a bug fix.”

Prior to this update, base building was somewhat clunky and limited. Version 1.21 introduced a revamped base building system. It smoothed out the placement of corridors and compartments and introduced the much-needed ability to visually see the blueprint of a base segment before committing resources to it. This "ghost preview" feature was a quality-of-life improvement that encouraged players to build grander, more complex seabases rather than just simple tubes.