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Co-op: host handoff, save codes, revives and item sharing

Quick answer

Buddy System adds proximity voice chat, direct item sharing and revival. Check everyone’s installed branch before diagnosing a connection or save problem.

How this guide was checked

Coverage: Early Access 1.2 · Buddy System Hotfix 2 (October 6) · official sources checked October 23, 2026 UTC · older routes retain their source/build limits. Research checked 8 Oct 2026. Updated 8 Oct 2026

This guide uses the linked sources and any attributed demonstrations. Platform differences and limitations are noted with the advice they affect.

See the 6 sources
6 sources
7 steps

Before you start

  • Official rules cited here cover Early Access 1.2 through Buddy System Hotfix 2; the host-handoff report is from launch.
  • Never replace a working save with an older branch copy as a troubleshooting shortcut.
1

What your group can use

Voice chat supports cross-platform proximity audio, push-to-talk and an off option. A revival preserves the downed player’s equipment and restores a little oxygen; reprinting returns them to the assigned Biobed. Tracking Tags help recover portable lockers and black boxes.

The official Early Access gameplay trailer gives a first look at the ocean and expedition equipment.

Subnautica · 0:00 · Full video 1:38

Source & footage context

May 2026 Early Access promotional footage. Equipment and mechanics may differ from later patches.

Source record ↗ · Checked 2026-09-13

Preview artwork: Unknown Worlds / KRAFTON. This is an illustration beside the video, not a frame from the selected timestamp.

The original creator hosts the recording. If playback is restricted, use the YouTube link.

Sources for this section
2

Check Pressure Tolerance on each player

Buddy System fixed clients completing the prologue without Pressure Tolerance after passing a scan with an adapted player or joining an already-progressed session. The notes do not promise automatic repair of every older affected character.

  1. Have each player open their own PDA Adaptations screen and check Pressure Tolerance. Sub2Wiki’s PC Solo Survival build 115506 route shows the acquired entry in green; current co-op presentation still needs verification.
  2. If still in the opening area, follow the local acquisition prompt rather than using the host’s progress as proof. The published solo route places the interaction on the right in the room reached after the first NOA door.
  3. If the adaptation remains missing on the current build, preserve the world and record when the client joined. Attach the affected save through the in-game feedback tool, which Buddy System supports. Kingy has not tested a repair for an already-affected save.
Sources for this section
3

Can a friend continue our world when the host is away?

A shared save gives your friend a copy of the world. PC Gamer reported handing its co-op world to another player in May. A save code is used to download a save; inviting someone into a running session is a separate action.

The reported route uses Upload to Cloud on the selected save and shares the resulting key. Buddy System officially added pasting Save Codes into Cloud Save Download. Kingy has not tested a host handoff or cross-platform transfer. The launch walkthrough includes conversion steps; check the current menu before changing a working save.

  1. Keep the original save and record its build, branch and last session before sharing.
  2. Have the recipient compare the save with their installed build. Hotfix 1 blocks incompatible saves from loading in older builds.
  3. Kingy recommends checking a known recent base change and each player’s progress in the recipient’s copy before continuing the group’s run.
Sources for this section
4

Which copy should the group continue?

Kingy recommends agreeing on one host and one saved copy for the next session, then identifying the newest copy before another handoff. Do not assume that progress made separately in two copies will merge.

Code reuse, expiry, repeated handoffs and cross-platform character retention still need a recorded current-build test. If an import fails, preserve both copies and record the exact error rather than overwriting the working world.

Sources for this section
5

Check the specific limitation

ProblemCurrent rule or check
Trade unavailable in a TadpoleLeave the vehicle; sharing while riding is blocked.
Push-to-talk failed before the hotfixInstall the current hotfix and recheck the assigned input.
Attached rider did not receive oxygenThe hotfix addresses Tadpole and Haul replenishment.
Older branch will not load a saveSaves now record build and branch and reject incompatible older builds.
Sources for this section
6

Make a useful issue report

Record platform, build, branch, host/client role and the exact message. If the problem followed an update, test without incompatible mods after preserving the save. Share reproduction steps through the in-game feedback or official support route; Kingy does not submit reports on your behalf.

Sources for this section
7

Voice detection and host-state display

Hotfix 2 reports consistent local/remote voice detection and fixes clients seeing the host as dead after their own character dies. These are distinct from push-to-talk bindings, microphone permissions or an actual disconnected host. Record build, host/client role and the observed state if the symptom persists.

Sources for this section

You’re ready when…

Your checklist

0 of 5 complete · Loading saved progress…

Sources · 6Official · Walkthrough · checked 23 Oct 2026 · Research checked 8 Oct 2026
Official Steam announcements ↗Released update history through Buddy System Hotfix 2 on October 6, including the September 3 turbine amendment. Older prelaunch announcements are historical.Official ·
Early Access 1.2: Buddy System ↗Current tool scans, co-op and base changes.Official ·
Buddy System Hotfix 1 ↗Save compatibility, oxygen and inventory-sharing fixes.Official ·
Co-op and sharing saved worlds: hands-on report ↗Firsthand launch-era report of giving another player a copy of the shared world. Its old no-revival claim is superseded by Buddy System; conversion clicks and current cross-platform transfer are not verified here.Walkthrough ·
Pressure Tolerance in the prologue ↗Self-reported PC keyboard/mouse Solo Survival build 115506, route updated June 6. Used only for the PDA Adaptations check and early interaction; current co-op behavior has not yet been tested.Walkthrough ·
Buddy System Hotfix 2 — October 6, 2026 ↗Official October 6 release notes: voice detection, Tadpole docking and teleporting, power streaming, Scanner Station accuracy, Shiver interaction with unpiloted vehicles, Biobed and rack visuals, black-box signal names, Xbox memory and crash diagnostics. Rollout may take time; no Kingy reproduction or universal save recovery.Official ·

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