Carrion

Gain access to your first Containment Unit.

Pretty sure there's at least one that's story related but here's a good list of where they are & tips on getting them if you need help:
https://holdtoreset.com/carrion-containment-units-locations-...

All 9 collectible locations with English commentary!

Full Game Walkthrough - All Achievements:
Containment Unit #2 (Frontier): 14:05
Containment Unit #1 (Military): 16:55
Containment Unit #8 (Armored): 1:23:05
Containment Unit #9 (Bunker): 1:27:40
Containment Unit #3 (Uranium): 1:42:55
Containment Unit #4 (Garden): 1:46:35
Containment Unit #5 (Reef Base): 1:49:40
Containment Unit #6 (Science HQ): 1:52:30
Containment Unit #7 (Nuclear): 1:55:55

Click on the video and it will jump exactly at the Containment run.

Containment units are optional areas that offer some helpful upgrades to your organism. For the most part they are passive enhancements. You will need to have all the main abilities in the game and have accessed every area before you can get to each containment unit.

https://gameplay.tips/guides/8163-carrion.html
map by demajen

The above map will be incredibly useful to find your way back to each area after having made it to the final area. The video will show you how to get to each containment unit from where you exited after completing the area, though a couple can be found on the way through the first time.

The first containment unit can be accessed in the Military Junkyard


00:00 Intro
00:47 Military Junkyard
02:16 Armored Warfare Facility
02:55 Bunker
03:43 Frontier-Wastelands
04:30 Control Room
05:00 Nuclear Power Plant
07:11 Leviathan Reef Base
08:28 Botanical Gardens
10:44 Uranium Mines
12:23 Relith Science HQ