How Co-Op Multiplayer Works In Subnautica 2

"Subnautica 2 has a maximum co-op limit of four players, meaning you and up to three other friends can play in the same party at one time. Fortunately, Subnautica 2 also has full cross-play support, meaning you can play with any friend on PC or Xbox. The game also supports cross-progression if you happen to own two systems and purchase two copies."

"From the start screen in Subnautica 2, you can choose to either "Host Multiplayer," which creates a world that you control, or "Join Friends," which allows you to join another player's world from your friends list. This screen also allows you to play through in single-player, as Subnautica 2 can be played from start to finish as a solo player, just like the previous two games."

"If you wish to create your own world, you can select "Host Multiplayer." From here, you either need to add friends through their unique, in-game Friend Code or invite them from your friends list after you've added them. At the time of writing, there's no form of world customization, so creating a co-op world simply means that you're playing through the normal game in multiplayer rather than solo."

Subnautica 2 enables co-op multiplayer for up to four players, allowing you and up to three friends to play together in the same party. The game includes full cross-play support, so players on PC and Xbox can play together. Cross-progression is also supported when the same player owns two systems and purchases two copies. From the start screen, players can choose to host multiplayer, creating and controlling a world, or join friends from a friends list. The game can also be completed in single-player. Hosting requires adding friends through unique in-game Friend Codes or inviting them from an added friends list, and joining requires adding the host using the Friend Code before joining from the friends list.

Read at GameSpot