Making your own engine is no frivolous decision for a developer to make. It’s a guaranteed investment of years of your life. Already a year or two into creating Natural Selection 2, Unknown Worlds dropped Source in 2008 and began creating their own technology, a proprietary engine called Spark.

In a series of notes submitted as evidence during the trial between Krafton and the ousted Unknown Worlds execs, Charlie Cleveland seemingly documents advice from former Nexon CEO Owen Mahoney.

In a new pre-trial brief, Krafton CEO Changhan Kim is accused of forming a secret task force called 'Project X' to seize control of Unknown Worlds.

It seems that Unknown Worlds has used sneaky tactics and introduced some Subnautica 2 screenshots in the original title for players to find.