4-Player Co-op
Subnautica 2 Multiplayer Guide
Cross-play, drop-in/drop-out, practical role splits and route planning for a four-player first session. Use this page with the map and biome depth pages before sending a full team into an unverified marker.
Co-op route prep
Check these before the group dives
Four players amplify every map mistake. Use these pages to choose route depth, patch-sensitive risks and confirmed markers before a long co-op session.
First route after the Lifepod
Filter to confirmed markers, run the first Silver and Old Habitat line, then add community markers only after you can return safely.
OpenMatch biome depth to gear
Check shallow-to-deep biome order and danger levels before pushing a co-op group or fresh save into a new zone.
OpenRe-check route changes after hotfixes
Use patch notes when a progression blocker, base current, Xbox option or mod compatibility issue behaves differently from an older build.
OpenHow 4-player co-op works
- Up to 4 Players — form a team of up to four Pioneers in any single-player save. Drop-in / drop-out, no separate multiplayer slot.
- Cross-Platform — Steam lists cross-platform multiplayer. PC and Xbox are the confirmed Early Access platforms. PlayStation and Switch are not supported — see platform availability.
- Xbox multiplayer access — EA 1.1 adds an Xbox notice for non-Game Pass subscribers and says a Game Pass subscription, any tier, is required to play multiplayer on Xbox.
- Group setup — plan host, voice chat and beacon naming before your first long session. Public matchmaking details should be checked in-game.
- Optional — the game is built single-player-first. No story or content is locked behind multiplayer.
Role Splits
The four roles a smooth team uses
| Role | Primary Job | Recommended Gear | Priority Unlock |
|---|---|---|---|
| Quartermaster | Stays near base, refines materials, monitors power and keeps spare food, water and oxygen ready. | Builder, repair tool, spare batteries | Stable first base |
| Gatherer | Runs short resource loops and feeds the Quartermaster a steady supply of basic materials. | Scanner, tank upgrade, beacon | Reliable resource loop |
| Scout | Pushes outward, drops beacons, records landmarks and confirms map markers. | Beacon stack, scanner, spare oxygen | Safe route outward |
| Biologist | Scans fauna and flora, tracks food and water, and warns the team before entering unknown ecosystems. | Scanner, food, water, first aid | Creature knowledge |
Trailer
See the team in action
Co-op risk patterns to watch
Treat these as launch-week safety habits until players confirm exact creature behavior:
Tight caves
Clustered players burn oxygen faster and block each other on exits. Send one scout in, keep the rest near the entrance, and mark the route with a beacon.
Resource noise
Four players strip a small area quickly and can lose their route home. Assign one player to beacon placement before everyone fans out.
Open deep water
Distant landmarks are already driving Reddit map speculation. Do not send the whole team toward an unconfirmed point until one scout has checked the return route.
EA 1.2 Buddy System · live since August 19
What the Buddy System update changed for co-op
The four headline co-op gaps from the roadmap - voice, trading, revives and emotes - are now live in the current build. The right-hand column records what shipped versus what the Buddy System notes do not list. See the full roadmap tracker for sequencing.
Source checked September 6, 2026: official Buddy System update notes. Boundary: in-game availability and Xbox rollout timing can lag the announcement; verify the features in your own session before routing a team plan around them.
| Co-op need | Live now (workaround) | EA 1.2 status |
|---|---|---|
| Voice communication | Proximity Chat is live - you hear teammates based on their position. | Shipped in EA 1.2 (August 19): the hugely requested Proximity Chat, replacing the Discord workaround. |
| Sharing items | Player Trading is live - easier item and inventory sharing between players. | Shipped in EA 1.2 (August 19): improved trading functionality. |
| Reviving teammates | Player Revive is live - downed teammates can be brought back in the field. | Shipped in EA 1.2 (August 19): co-op revives. |
| Coordination tools | Beacons and pinged landmarks, plus the new Emotes for quick expression. | Emotes shipped in EA 1.2. HUD Signals, a Base Builder Tool and Pinned Recipes are still not listed in the shipped update notes - treat them as pending until a patch note names them. |
FAQ
Co-op questions players ask
How many players is Subnautica 2 co-op?
Up to 4 players. Any single-player save can be opened to a team of four Pioneers with drop-in / drop-out joining - there is no separate multiplayer slot, and no story or content is locked behind co-op.
Is Subnautica 2 cross-platform?
Yes. The Steam store lists cross-platform multiplayer, so PC players (Steam, Epic) and Xbox Series X|S players can share a session. PlayStation and Switch are not Early Access platforms, so they cannot join. On Xbox, EA 1.1 notes say a Game Pass subscription is required to enter multiplayer.
What did the EA 1.2 update add for co-op?
EA 1.2, the Buddy System update released August 19, 2026, shipped Proximity Chat, Player Revive, Emotes and Player Trading - the four headline co-op features from the roadmap. HUD Signals, a Base Builder Tool and a Pinned Recipes system are not in the shipped notes, so treat those as still pending.