No spoilers] So i was checking what Unknown worlds is doing to below zero and came across this. Its a real game. Below zero isn't going to be realsed in the US.
Subnautica Steam Game (PC/MAC) - UK/EUROPE only - (no CD/DVD) | eBay
Subnautica [Steam] - PlayGoSmart
Subnautica: Below Zero - Metacritic
Subnautica: Below Zero PC GAME [Offline] | Lazada
Subnautica (Game Preview) Is Now Available For Xbox One - Xbox Wire