Subnautica is an open world underwater exploration and construction game. We are Unknown Worlds, the developers of Natural Selection 2, and Subnautica is our new project. Subnautica will combine elements of role playing, sandbox, exploration and cinematic games to create a unique experience, the genre of which we do not believe has yet been invented.
The Subnautica Terrain Test is a tool that allows users to create procedural, underwater, semi-realistic terrain. A programmer can write a terrain generation algorithm, edit it, and see the terrain change in real time. It is available for free.
The Terrain Test is part of the development of Subnautica, an underwater open world exploration and construction game currently in development at Unknown Worlds.