How to Make Hydrochloric Acid Subnautica: Recipe and Resource Guide

Hydrochloric Acid is a critical chemical compound in Subnautica that unlocks essential high-tier crafting recipes. As players descend deeper into Planet 4546B, gathering the necessary ingredients to produce this compound becomes vital for advancing survival technology. Understanding where to locate these raw resources efficiently ensures a smooth transition into mid-and-late-game exploration.

The Required Blueprint and Ingredients

Crafting Hydrochloric Acid requires two main components processed inside the Fabricator. Players must combine three Deep Shrooms with one Salt Deposit under the Advanced Materials tab. The blueprint automatically unlocks as soon as you harvest your first Deep Shroom in the wild.

Finding Deep Shrooms and Salt Deposits

Deep Shrooms are distinct white fungi primarily found in deeper biomes such as the Blood Kelp Zone and the Lost River. Navigating these treacherous underwater environments requires proper depth upgrades and careful maneuvering around hazardous fauna. Salt Deposits are far easier to acquire, appearing as white crystal nodes scattered across shallow biomes like the Grassy Plateaus and Kelp Forest.

Essential Crafting Uses for Hydrochloric Acid

Once synthesized, Hydrochloric Acid acts as a core component for crafting Polyaniline. Polyaniline is an indispensable advanced material used to manufacture valuable equipment, vehicle upgrades, and habitat modules. Additionally, keeping a stock of this acid allows players to maintain high crafting flexibility during major base expansions.

Tips for Farming Deep Shrooms Safely

Rather than making repeated trips into dangerous abysses, players can cultivate Deep Shrooms using an Exterior Growbed. Striking a wild Deep Shroom with a survival knife yields seeds that can be planted safely near your sea base. This simple strategy creates a sustainable supply of materials for all future chemical needs.