Does Subnautica 2 have co-op?

The Steam page describes Subnautica 2 as playable alone or with friends in 4-player co-op.

Is Subnautica 2 cross-platform multiplayer confirmed?

Steam lists cross-platform multiplayer as a feature. Store-specific invite and save behavior should be verified after launch.

Multiplayer guide

Subnautica 2 Co-op Setup Guide

Steam lists online co-op and cross-platform multiplayer. This page keeps confirmed facts separate from launch-week testing notes.

Confirmed

Subnautica 2 is described as playable alone or with friends in 4-player co-op.
Steam feature tags list single-player, online co-op, and cross-platform multiplayer.
Broadband internet is listed in the official system requirements.

First Session Checklist

Pick the player with the strongest PC and most stable connection as hostStability Set up voice chat before entering the worldCoordination Assign roles: builder, scout, collector, navigatorEfficiency Keep a shared note for bugs and desync issuesEarly Access

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Launch Questions to Verify

These should be tested after launch before we publish firm answers.

Whether save progress is host-owned or shared.
How cross-platform invites work across Steam, Xbox, and PC Game Pass.
Whether story progress, blueprints, and map discoveries sync equally for all players.
How reconnects behave after a crash or network drop.

Co-op FAQ

How many players can play together?

Public store copy describes 4-player co-op. Launch testing should confirm how invites, hosting, and reconnects work in practice.

Who owns the co-op save?

This is not confirmed here yet. We will test whether the host owns the save and whether guest progress persists after reconnecting.

Should my group wait for patches?

If your first session is important, check the updates page and known issues before starting a long co-op world.