It's time to dip your toes back into the world of planet 4546B with Subnautica Below Zero, sequel to Unknown Worlds' original aquatic explore-'em-up.
This time out you've crash landed in the chillier bit of 4546B, landing on the surface this time but soon becoming compelled to dive below the surface. Your sister is missing, you see, and it's up to you to find the team she disappeared with and unravel the mystery of what happened to them.
As in Subnautica before it, Below Zero is very much focused on exploration and survival. The story is there to tug you along, but the game is designed to let you go at your own pace as you make your way around this strange underwater world, gathering items and crafting. The aquatic biome is as dangerous as it is beautiful, and finding the things you need to survive - as well as to build your home base - will be the difference between life and a very chilly death.