User blog comment:Ted509/Subnautica and Natural Selection 2 Crossover?/@comment-71.74.141.109-20170101053840

It's confirmed they take place in the same universe. They even talk about Alterra funding something. (Natural Selection 2) and about smuggling equipment that isn't Alterra onto the Aroura in PDAs. Phasegates are talked about, too. In fact, you get a message from Alterra about building a vessel that will break the atmosphere and get you to the nearest Phasegate. It also references the three corporations in PDAs.