imageSteam official listing
Official Steam page
Official store page confirms 4-player co-op and current feature flags.
Official sourceSubnautica 2 Multiplayer
Subnautica 2 GuideWhat is officially confirmed for co-op right now.
Quick answer
Subnautica 2 supports 4-player co-op (host + up to 3 friends) per official store/platform messaging. After Hotfix 3, version sync still matters because multiplayer fixes can affect rejoin behavior and session stability.
Verified against the source list below on June 24, 2026.
Status matrix
Current answer
Online co-op is supported
The current official messaging lists multiplayer support.
Player count
Up to 4 total
You plus up to 3 friends.
Solo play
Yes, solo remains supported
Multiplayer is optional, not required.
Best check
Sync patch versions first
Then host from the in-game multiplayer menu.
Use this snapshot for current platform availability, not general release rumors.
Official Media
Embedded official trailers and screenshots are shown inline so readers can verify the current game presentation without leaving the guide.
videoOfficial YouTube
Diving Together in Multiplayer developer overview
Official multiplayer-focused video for co-op context.
Official sourcevideoOfficial YouTube
Subnautica 2 Game Preview gameplay trailer
Official gameplay trailer useful for co-op and platform context.
Official sourceVerification
Last verified: June 24, 2026
Where to Find It
- Steam feature list and description mention online co-op.
- Xbox Wire confirms co-op framing and cross-platform invite support.
- In-game menus may evolve during Early Access updates.
How to Use It
- Keep all players on current version before sessions.
- Start with short progression sessions after patches to validate stability.
- If issues occur, retry after relog and version sync.
FAQ
How many players are supported?
Up to 4 total players (you plus up to 3 friends).
How do I start co-op quickly?
Use Host Multiplayer from the main menu, then invite friends; all players should update to the same patch first.
Is solo still supported?
Yes, solo remains a valid play path.
Will multiplayer behavior change?
Yes, Early Access features can be tuned over time.
Did the latest hotfix affect multiplayer?
Hotfix 3 specifically fixed a client rejoin position issue, so keep everyone updated before troubleshooting.