confirmedFAQ
Is Subnautica 2 Co-op?
Yes. Steam lists Subnautica 2 as supporting online co-op with up to three friends, or four players total.
Expanded answer
The currently confirmed multiplayer fact is that Subnautica 2 supports online co-op for up to three friends, meaning a four-player total session size.
That answer is safe to publish because it appears in official messaging and on the Steam store page.
Steam also lists Cross-Platform Multiplayer, but that still does not automatically answer every technical question about hosting or session flow.
Related pages
Last updated: 2026-05-09
Source note: this answer stays intentionally conservative. Unknown topics are marked as unknown until official sources make them explicit.