Subnautica developer Unknown Worlds has begun teasing its upcoming sequel by hiding screenshots in the 2018 open-world survival game. The indie title, which was in early access for two years before it launched to critical acclaim, ultimately won several awards and was nominated for even more. Subnautica‘s beautiful underwater world, engaging survival elements, and underlying mysteries appealed to gamers, who understandably have been clamoring for new content ever since.