Image credit: Unknown Worlds/Krafton At the end of Subnautica 2 's prologue, fear has already set in - and I haven't even reached its new ocean planet, Proteus, yet. I'm not thalassophobic by any means, but right from the off, Subnautica 2 - my first experience with developer Unknown Worlds' hugely popular survival series - is enough to make anyone uncomfortable. After finding myself inside a ruined underwater base on a completely different planet, where I discover a fellow Pioneer has already taken it upon themselves to cut their own life short, it already feels like the start of a long, stressful journey. And that's before the horrors of Proteus make themselves known. Your mission in Subnautica 2 is to help build a new future for humanity, and you've got 40K colonists depending on you. That brings you to Proteus, a brand-new ocean planet distinct from 4546B seen in earlier Subnautica games, and it's immediately overwhelming.…