Subnautica 2 multiplayer explained - crossplay and four-player co-op

Subnautica 2’s early access adds four-player co-op, the series’ first full multiplayer support.

Players can host friends, convert single-player saves, and continue shared worlds across sessions.

Crossplay is supported through friend codes, making it easier to connect across PC, Xbox, Steam, Epic, and Windows Store.

Cloud saves let one player upload a shared game so others can pick it up later.