Subnautica 2 Experimental on Steam and Xbox: Access and Separate Saves

What the Experimental branch is

The Experimental branch is an opt-in preview on Steam and Xbox. Unknown Worlds uses it to show upcoming content in an earlier state and catch problems before features reach the main Early Access build. It may also preview smaller patches and fixes between major updates.

This announcement changes the testing workflow, not the public patch baseline. Buddy System Hotfix 1 is now the latest public main-branch update; Experimental remains the place to preview what may ship next.

Experimental saves do not transfer

The official warning is unambiguous: saves are not compatible between Experimental and the main branch. You cannot import a main-branch save into Experimental or export an Experimental save back to the main build. The game stores the two versions in separate locations, so your main saves should disappear from the in-game list while Experimental is active and reappear when you switch back.

On a Steam Windows installation, keep a manual copy of your main SaveGames folder before opting in. Use the platform-specific save guide for other installations. Separate locations reduce accidental loading, but preview saves can still be affected by bugs or future format changes. The game’s cross-platform Save Code feature does not permit a transfer between the main and Experimental branches.

How to opt in on Steam

1. Open your Steam Library and right-click Subnautica 2.
2. Select Properties, then open the Game Versions & Betas tab.
3. In Beta Participation, select Experimental.
4. Close the window and let Steam download the branch before launching.

How to join on Xbox console or PC

The official announcement requires participants to be 18 or older and either own Subnautica 2 or have an active Game Pass Ultimate subscription. The Xbox route uses Insider Hub rather than Steam’s beta menu.

1. Install the free Xbox Insider Hub app from the Store on your Xbox console or PC.
2. Open it and sign in with your account.
3. Open Previews, select Subnautica 2 Experimental (Public Test), then choose Join.
4. Wait for registration to complete and follow the installation prompt. The announcement says a console restart may be needed to trigger the update.

The announcement provides these Steam and Xbox access paths. It does not give an Epic Games Store enrollment procedure. Keep your main-branch world separate whichever testing platform you use.

What to expect from the preview build

• More bugs. Unknown Worlds warns that Experimental builds can contain game-breaking bugs.
• No daily cadence for now. The team says builds will be uploaded shortly before wider releases rather than updated every day as the original Subnautica and Below Zero branches were.
• Separate test worlds. Start a new Experimental world for testing. Backing up a main-branch save does not make it compatible with Experimental.
• Feedback is part of the point. The official announcement points players to a support FAQ for reporting bugs and providing feedback; include the branch and build in every report.

Official sources: Unknown Worlds Experimental announcement, including Steam and Xbox steps and the Steam announcement.