UNLOCK // PDA CASE FILE
Can't Unlock Alien Containment in Subnautica
Alien Containment is a data-box or fixed-facility unlock, then a placement-restricted base module. Searching for fragments or trying to place it in a corridor leads to the wrong solution.
LAST CHECK
ANSWER LOCK // QUICK RESPONSE
Open an Alien Containment data box in a Bulb Zone, Mountains, or Underwater Islands wreck, or scan the intact unit in the Deep Grand Reef Degasi Seabase. Build it in the center of a Multipurpose Room or Large Room with the Habitat Builder.
SIGNAL CONFIRMEDBLUEPRINT DIAGNOSTIC // WHY IT ISN'T UNLOCKING
Alien Containment is not a normal fragment set and it cannot be placed in every base compartment. You need the data-box or fixed-facility unlock plus a valid large-room placement.
UNLOCK CHECKLIST
- Open an Alien Containment data box or scan the Deep Grand Reef Degasi Seabase unit
- Build a Multipurpose Room or Large Room
- Place the containment in the room center with the Habitat Builder
BRING THIS
- Scanner
- Habitat Builder
- Multipurpose Room or Large Room
- Beacon for the Deep Grand Reef route
DATA ACCESS LEVEL
Reveal only as much as you need
COMMON REASONS YOU ARE STUCK
- Searching for Alien Containment fragments
- Trying to build it in a corridor or ordinary room wall
- Leaving the Degasi Seabase before scanning the intact unit
- Forgetting that a hatch is needed to enter the tank
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
- SOURCE // 01Alien Containment OPEN SOURCE ↗WIKI · checked 2026-09-01
- SOURCE // 02Deep Grand Reef Degasi Seabase OPEN SOURCE ↗WIKI · checked 2026-09-01
- SOURCE // 03Multipurpose Room OPEN SOURCE ↗WIKI · checked 2026-09-01