Online co-op
Confirmed
Up to 4 players online.
Co-op question
Does Subnautica 2 Have Split-Screen Co-op?
A direct answer for players asking about couch co-op, local multiplayer, and online co-op differences.
Quick answer: Official listings confirm online co-op for up to 4 players. They do not confirm local split-screen couch co-op.
Solo play
Confirmed
You can play without a group.
Local split-screen
Not confirmed
Do not assume couch co-op unless official pages add it.
Online co-op vs split-screen
Online co-op
Each player joins from their own system and account over the network.
Split-screen co-op
Multiple local players share one screen. This is a separate feature and is not confirmed by the current listings.
Plan online co-op instead
Use these pages if you are setting up a group for launch week.