SUBNAUTICA DATABASE GUIDE
BROWSE

GUIDE INDEX

BELOW ZERO PROBLEM ROUTES
BELOW ZEROOPEN HUB ↗
NEXTWhat to do nextFINDCan't findUNLOCKCan't unlock
FIELD RECORD // UNLOCK
GAME // below zeroENTITY // RebreatherVERIFIED

UNLOCK // PDA CASE FILE

Can't Unlock the Rebreather in Below Zero

The Rebreather is not a separate fragment hunt. In Below Zero, crafting the High Capacity O₂ Tank unlocks its blueprint, after which the Rebreather is made at the Fabricator and equipped in the head slot.

LAST CHECK

ANSWER LOCK // QUICK RESPONSE

Craft the High Capacity O₂ Tank first. That action unlocks the Rebreather blueprint; then craft the Rebreather at the Fabricator and equip it in the head slot for deeper dives.

SIGNAL CONFIRMED

BLUEPRINT DIAGNOSTIC // WHY IT ISN'T UNLOCKING

The Rebreather is chained to the High Capacity O₂ Tank. Searching for a Rebreather fragment or waiting for a story event will not unlock it.

UNLOCK CHECKLIST

  • Unlock the High Capacity O₂ Tank data-box blueprint
  • Craft the High Capacity O₂ Tank
  • Craft and equip the Rebreather from the Fabricator

BRING THIS

  • Fabricator
  • High Capacity O₂ Tank
  • Head-slot access in the PDA

DATA ACCESS LEVEL

Reveal only as much as you need

COMMON REASONS YOU ARE STUCK

  • Searching for Rebreather fragments
  • Crafting the tank but not the Rebreather
  • Equipping the Rebreather in the wrong slot
  • Assuming it removes all cold or oxygen hazards

NEXT WAYPOINTS

Can't Unlock the High Capacity O₂ Tank in Below Zero Can't Find Copper in Below Zero What to Do After Building the Seatruck in Below Zero

EVIDENCE LOG

Verification record

Facts on this page are separated from player speculation. Version-sensitive answers should be rechecked after an official update.

LAST CHECK2026-09-01