You start with very little in Subnautica 2: a shoddy lifepod and no real idea of where to go next. The idea is to branch out gradually, to make sense of your surroundings, and to find ways to make exploration easier. One of the first things you'll need to craft is the basic battery, and here's how. Exploration and discovery are key if you want to last in survival games, with Subnautica 2 being especially hostile: the environment is mostly water, so controlling our surroundings is difficult, and we must instead adapt to this inhospitable place. However, forging ahead is non-negotiable, so you will need to be able to craft the basics as and when they are needed.