Subnautica 2 Experimental Saves: Why Your World Looks Missing
Your Subnautica 2 world has probably not been deleted. Experimental and Default keep separate saves, so each build only shows the worlds created for that branch.
Switching Subnautica 2 to Experimental can make the load screen look empty. That is expected behaviour: Unknown Worlds stores Experimental and Default saves separately, and neither branch can import or display the other's worlds.
Your original world should return when you launch the Default build again. A world created in Experimental will only appear while Experimental is running.
Why the save list changes
The Experimental branch is an opt-in test build for upcoming content. Unknown Worlds warns that it may contain serious bugs and says not to become attached to saves made there. Keeping its saves separate prevents a test build from opening and changing a stable world.
The separation works both ways. Experimental hides Default saves, while Default hides Experimental saves. Switching branches does not merge them, and the game does not support importing or exporting a world between the two versions.
Before changing builds, close the game fully and make a backup. The official support guidance recommends backing up saves because Experimental is work in progress, even though simply changing branch should leave the other branch's worlds in place.
Return to Default on Steam
Open your Steam Library, right-click Subnautica 2 and choose Properties. Open the Betas tab, find Beta Participation and select None. Close the window and let Steam download the stable build before launching the game.
Steam only keeps one build installed at a time. Opting into Experimental replaces the Default installation, and switching back replaces Experimental. Steam downloads the files that differ rather than installing a second full copy.
Once the stable download is complete, launch Subnautica 2 and check the load screen again. Your original Default worlds should be visible. Any world started in Experimental will disappear from that screen until you opt back into Experimental.
Open the correct version on Xbox
Xbox handles the test differently. The Experimental build is installed as a separate app through Xbox Insider Hub, so it can sit beside the regular Subnautica 2 installation.
If your normal world is missing, exit the Experimental app and launch the standard Subnautica 2 app from My games & apps. The standard app shows Default saves; the Experimental app shows Experimental saves. Check the app name before assuming the save failed.
Keeping both versions installed uses more storage, but it also means you do not need to switch a beta setting whenever you want to return to the stable game.
If the correct branch is still empty
First confirm that the update has completely finished and that you launched the same platform account that created the world. Restart Steam or the Xbox, then open the correct build again. Do not rename, move or overwrite save folders while the branch is still uncertain.
If a Default world remains missing in the Default build, or an Experimental world remains missing in Experimental, stop before trying community file edits. Take a screenshot of the empty load screen and submit a request through the official Subnautica 2 Help Center. Mention your platform, the branch where the world was created and the branch currently running.
The key check is simple: an empty list immediately after changing branch usually means the other set of saves is being hidden as designed. Return to the build that created the world before treating it as a lost-save problem.