Subnautica 2 Multiplayer: Co-op and Buddy System

Subnautica 2 supports solo play or co-op with up to three friends, according to the official launch post. The current Steam listing also identifies cross-platform multiplayer. Check the destination storefront and account requirements for the platform you use.

The features that changed launch-week advice

The August 19 Buddy System update added distance-based proximity voice, a revive action before reprinting, emotes and direct inventory exchange. Voice can be always on, push-to-talk or off. Revived players keep equipment and receive some oxygen. Choosing immediate reprinting is a different action.

The old claim that every group must use external voice chat or drop items manually is obsolete. That does not mean an external chat application is prohibited or that a revive guarantees recovery from every hazard.

If voice or trading does not work

Our recommended checks are:

1. Confirm the group is using the intended branch and current update. A test-branch clip may not match a main-branch session.
2. Check voice mode and the assigned push-to-talk control. The September hotfix addressed push-to-talk, and October’s addressed voice detection.
3. For trading, test outside the Tadpole: the September note says inventory sharing is blocked while riding it.
4. Capture host/client status and the exact failed action before reporting a persistent issue.

Do not use a stale menu walkthrough as proof that the current button is missing. UI details can change; use the current in-game prompt.

A useful team plan

Our suggestion is to divide the current objective rather than invent permanent classes. One player can track the required ingredients, another can record the return landmark, and everyone should know where to regroup. Choose responsibilities based on the actual tools unlocked in the save.

If a player lacks Camp One or Old Habitat signals, compare host/client state and the build; August’s notes address client triggers. For a missing ruins Blackbox name, see October’s fixes.

Is co-op required?

No. The official product description supports solo play as well as optional co-op.

Are saves interchangeable with Experimental?

The Experimental announcement describes separate, incompatible saves. Keep the distinction when arranging a group; see the official branch note linked from the roadmap.