Once you have become reasonably self-sufficient in Subnautica 2, you'll find that regular resources found in your environment just won't cut it anymore. More advanced equipment requires more refined ingredients, with strong acid being a component of many recipes and in many tools. Refining resources in this survival game requires knowledge and time, but they can be a game-changer once you know what you're doing. Strong acid is something that can only be crafted when you're outside of the starting area, but if you're forging ahead in Subnautica 2, then it won't be long before you need this resource. Here's how to craft strong acid, and what it's used for.