Colonist group in the Cave of stars: One of the options how to find this place -> Enter the Cave of stars from the Osiris office near the evac zone. After exiting the office, the Colonist group is on your left under an Osiris structure.
Colonist group in the Sparkling pool: One of the options how to find this place -> Near the evac landing pad is a cave marked with white symbols and blue artifacts. Colonist group is on the right after you enter the cave.
Colonist group in the Korolev Quarry: One of the options how to find this place -> Enter Korolev Island HQ, then left it by going down towards Korolev Quarry. Colonist group can be found on the left side behind the fence when you enter the cave.