Strong acid is an advanced crafting material in Subnautica 2 that serves as a key ingredient in several high-tier recipes, including advanced battery upgrades, hull reinforcement modules, and specialized base construction materials. Unlike basic resources like titanium or copper, strong acid cannot be found in the environment directly; it must be crafted at a fabricator using specific organic and mineral components. This makes it a mid-to-late game resource that players will need once they begin upgrading their equipment and expanding their base infrastructure.
The primary use for strong acid is in the creation of the High-Capacity Power Cell, which stores twice the energy of a standard power cell and is essential for extended deep-sea exploration in vehicles. Each high-capacity power cell requires 2 strong acid, making it one of the most demanding recipes in terms of acid consumption. Players who use multiple vehicles or maintain a large base with automated systems will need a steady supply of strong acid to keep their power infrastructure running efficiently.
Strong acid is also required for the Hull Reinforcement Module Mark II, which reduces all incoming vehicle damage by 30% (an upgrade from the Mark I's 15% reduction). This module is essential for operating in Leviathan-infested biomes such as the Sparse Plains and the Collector Leviathan territory. The Mark II module requires 3 strong acid, along with 1 titanium ingot and 1 diamond, making it a significant investment that underscores the importance of reliable acid farming.
Beyond vehicle upgrades, strong acid is used in the Base Corridor Reinforcement module, which increases the structural integrity of base corridors and prevents hull breaches at extreme depths. This module requires 1 strong acid per corridor section and is essential for building bases below 200 meters. Given the wide range of applications, players should aim to craft strong acid in batches of 5-10 whenever they gather the necessary materials, ensuring they always have a supply on hand for future crafting needs.
What Strong Acid Is and Why You Need It
Strong acid is an advanced crafting material in Subnautica 2 that serves as a key ingredient in several high-tier recipes, including advanced battery upgrades, hull reinforcement modules, and specialized base construction materials. Unlike basic resources like titanium or copper, strong acid cannot be found in the environment directly; it must be crafted at a fabricator using specific organic and mineral components. This makes it a mid-to-late game resource that players will need once they begin upgrading their equipment and expanding their base infrastructure.
The primary use for strong acid is in the creation of the High-Capacity Power Cell, which stores twice the energy of a standard power cell and is essential for extended deep-sea exploration in vehicles. Each high-capacity power cell requires 2 strong acid, making it one of the most demanding recipes in terms of acid consumption. Players who use multiple vehicles or maintain a large base with automated systems will need a steady supply of strong acid to keep their power infrastructure running efficiently.
Strong acid is also required for the Hull Reinforcement Module Mark II, which reduces all incoming vehicle damage by 30% (an upgrade from the Mark I's 15% reduction). This module is essential for operating in Leviathan-infested biomes such as the Sparse Plains and the Collector Leviathan territory. The Mark II module requires 3 strong acid, along with 1 titanium ingot and 1 diamond, making it a significant investment that underscores the importance of reliable acid farming.
Beyond vehicle upgrades, strong acid is used in the Base Corridor Reinforcement module, which increases the structural integrity of base corridors and prevents hull breaches at extreme depths. This module requires 1 strong acid per corridor section and is essential for building bases below 200 meters. Given the wide range of applications, players should aim to craft strong acid in batches of 5-10 whenever they gather the necessary materials, ensuring they always have a supply on hand for future crafting needs.
Where to Find Acid-Producing Organisms
The two primary biological components needed for strong acid are acid mushrooms and sulfur. Acid mushrooms are organic growths found in shallow cave systems throughout the Safe Shallows and Grassy Plateaus biomes. These mushrooms have a distinctive yellow-green coloration with a slightly translucent cap that pulses with bioluminescence in low light. Each acid mushroom can be harvested by hand, yielding 1 mushroom per plant, and they respawn approximately every 30 minutes in the same locations.
The best locations for acid mushroom farming are the cave systems in the Safe Shallows, particularly the caves along the eastern and southern borders of the starting biome. These caves typically contain 5-8 acid mushrooms each, and a thorough sweep of all nearby caves can yield 15-20 mushrooms in a single 15-minute session. The caves are shallow (10-30 meters depth) and free of dangerous predators, making this a safe and reliable farming activity even for new players. Bring a flashlight, as the caves can be dark, and watch for loose rock formations that may collapse when disturbed.
Sulfur, the second component, is obtained from volcanic vents in the deep zones. These vents are found at depths of 200-400 meters, primarily in the Deep Trench biome and near thermal vent clusters in the western region of the map. Sulfur deposits appear as yellow crystalline formations around the edges of the vents and can be harvested with a survival knife or drill arm. Each deposit yields 1-2 sulfur, and deposits respawn every 45 minutes. The volcanic vents are extremely hot, and players should equip a Reinforced Dive Suit or use a vehicle to avoid taking thermal damage while harvesting.
Salt, the third and final component, is abundant throughout the game and can be found in nearly every biome. Salt deposits appear as white crystalline formations on the seafloor and can be harvested by hand. The Safe Shallows and Grassy Plateaus have the highest concentration of salt deposits, and most players will accumulate a surplus of salt through normal gameplay. If you need to farm salt specifically, the shallow waters around your base are the most convenient location, as salt respawns quickly and can be gathered without any specialized equipment.
Crafting Recipe and Required Materials
The strong acid crafting recipe is straightforward but requires materials from multiple biomes, making it a recipe that naturally encourages exploration. To craft 1 unit of strong acid, you need 2 acid mushrooms, 1 sulfur, and 1 salt. The recipe is prepared at any standard fabricator, including those found in your base, the lifepod, or inside vehicles equipped with a fabricator module. The crafting process takes approximately 10 seconds per unit and consumes the materials immediately upon initiation.
The recipe unlocks automatically in your PDA the first time you collect an acid mushroom, which typically happens within the first few hours of gameplay as players explore the shallow caves near their starting location. However, the recipe cannot be fully utilized until you have access to sulfur, which requires diving to 200+ meters or finding a volcanic vent in a deeper biome. This natural gating ensures that strong acid crafting becomes relevant at the appropriate stage of progression, rather than being available immediately at the start of the game.
For efficient batch crafting, gather all your materials before starting the process. A typical crafting session might involve gathering 20 acid mushrooms (from 2-3 cave sweeps), 10 sulfur (from 1-2 volcanic vent visits), and 10 salt (from the seafloor near your base). This allows you to craft 10 units of strong acid in a single session, which is enough for several high-tier recipes. Store the crafted strong acid in a waterproof locker near your fabricator for easy access when crafting upgrades and modules.
If you are playing in co-op mode, divide the gathering tasks among your team for maximum efficiency. One player can farm acid mushrooms in the shallow caves while another dives deep for sulfur, and a third gathers salt and prepares the fabricator station. This parallel gathering approach can reduce the total crafting preparation time from 30 minutes to under 10 minutes, making it the most efficient way to produce strong acid in bulk. Remember to communicate your material counts so the team knows when enough has been gathered to begin crafting.
Uses for Strong Acid in Base and Vehicle Modules
Strong acid is a critical component in several high-tier crafting recipes that span both base building and vehicle upgrade categories. Understanding the full range of uses helps you prioritize which recipes to craft first and how to allocate your acid supply effectively. Below is a detailed breakdown of the most important recipes that require strong acid.
High-Capacity Power Cell: This upgraded power cell stores 200 energy units (double the standard 100) and is used to power vehicles and base modules for extended periods. The recipe requires 2 strong acid, 1 standard power cell, and 1 lithium. High-capacity power cells are essential for long deep-sea exploration missions, as they significantly extend the operational range of your Seamoth, Tadpole, and Prawn Suit. Craft at least 4-6 of these to equip all your vehicles with upgraded power systems.
Hull Reinforcement Module Mark II: This vehicle upgrade reduces all incoming damage by 30%, a significant improvement over the Mark I's 15% reduction. The recipe requires 3 strong acid, 1 titanium ingot, and 1 diamond. This module is essential for operating in Leviathan-infested biomes, as it can mean the difference between surviving a Collector Leviathan attack and losing your vehicle entirely. Install it on any vehicle you plan to take into the Sparse Plains or Deep Trench biomes.
Advanced Battery Upgrade: This upgrade increases the energy storage of standard batteries by 50%, extending the operational life of tools like the Repair Tool, Scanner, and Propulsion Cannon. The recipe requires 1 strong acid, 1 standard battery, and 1 copper wire. While not as critical as the power cell or hull reinforcement upgrades, the advanced battery is a quality-of-life improvement that reduces the frequency of battery swaps during extended operations.
Base Corridor Reinforcement: This module increases the hull integrity of base corridors, allowing bases to be constructed at greater depths without suffering structural failures. The recipe requires 1 strong acid, 1 titanium, and 1 silicone rubber per corridor section. This module is essential for players building deep-sea bases below 200 meters, as unreinforced corridors will crack and flood at extreme depths. Always craft enough reinforcement modules for your entire base structure before beginning construction at depth, as a single unreinforced corridor can compromise the integrity of the entire base.