Strong Acid is one of the first mid-game crafting materials that separates early-game survivors from players ready to push into Proteus’s deeper waters. Unlike Mild Acid, which you can produce from Acidic Raion Pouches found near your starting area, Strong Acid demands that you travel further from your Lifepod and unlock a dedicated crafting station. The payoff justifies the effort: Strong Acid goes into Power Cells, fiber mesh, and advanced batteries, making it a hard requirement for building your first Tadpole submarine.
This guide covers everything you need to craft Strong Acid in Subnautica 2, including the Processor blueprint location, where to find Necrolei Cysts on Stilt Orbs, and the alternative recipe using Gold and Sulfur.
What Strong Acid Is Used For in Subnautica 2
Strong Acid is a key component in several mid-tier blueprints that mark the shift out of early-game survival:
- Power Cell – Required to build and power the Tadpole submarine
- Fiber Mesh – Used in advanced equipment crafting
- Advanced Battery – Powers high-tier tools and base equipment
Getting a steady supply early opens your path to the Tadpole, which is the vehicle that unlocks deeper regions and biomes across Proteus.
How to Unlock the Processor Blueprint in Subnautica 2
You cannot craft Strong Acid without a Processor, and you cannot build a Processor without scanning one first. Head to the Old Habitat, which sits roughly 350 to 400 meters north of your Lifepod.
NOA will eventually send you to the Old Habitat to track down a Blackbox during the main story, so you can wait for that mission waypoint if you want a direct marker. You can also swim there at any point before receiving the mission.
Once inside, head to the upper level. You will find the Processor in a corner near a set of storage lockers, directly below the Quaker’s Blackbox signal. Scan it once to unlock the blueprint permanently.
With the blueprint unlocked, build a Processor inside your own base. The Processor requires its own power supply, so make sure you have solar panels or another power source set up before placing it. Building the Processor requires:
- Titanium
- Copper Wire
- Mild Acid (crafted from Copper and two Acidic Raion Pouches)
Where to Find Necrolei Cysts in Subnautica 2
Necrolei Cysts grow on top of Stilt Orbs, a unique lifeform found in one location during the current Early Access build. Stilt Orbs look like green spherical orbs floating just above the seafloor, anchored by bright pink or purple tentacle-like strands. Each orb carries a star-shaped Necrolei Cyst on top. You need a Survival Multitool to cut the cysts free.
How to reach the Stilt Orb field:
Head north from your Lifepod approximately 250 to 400 meters on a bearing of 345 degrees, just west of due north. Hold that heading and you will reach the field without needing any signals or environmental markers. Watch for a large spread of tall purple sea life that resembles massive anemones. At night, the area glows purple as you approach, making it visible from a distance even without the Flashlight.
The best farming spot sits a few meters west of the Old Habitat, on a plateau overlooking the facility. The far western edge of the coral forest, right at the edge before the deep dropoff, holds the densest patches of Stilt Orbs. A single trip here yields enough Necrolei Cysts for several batches of Strong Acid.
Drop a Beacon at this location on your first visit. You will return here regularly, and the Beacon removes all guesswork on future runs.
How to Craft Strong Acid in Subnautica 2
With at least two Necrolei Cysts in your inventory and a powered Processor in your base, walk up to the Processor and open the Configure Processor menu.
Step-by-step crafting instructions:
- Open the Processor menu
- Select Change Recipes at the bottom of the interface
- Choose Strong Acid from the recipe list
- Add two Necrolei Cysts to the input bin
- Press Load Processor to start production
- Wait 30 seconds for processing to complete
- Collect Strong Acid from the output section on the right
You can press Load Processor multiple times in a row to queue additional batches automatically if your inventory holds enough cysts. This is the fastest way to stockpile Strong Acid before a major build session.
Alternative Strong Acid Recipe: Gold and Sulfur
Subnautica 2 includes a second recipe for Strong Acid that uses one Gold and one Sulfur instead of Necrolei Cysts. This method takes 60 seconds per batch, double the time of the Necrolei Cyst route.
The access barrier is significant. Both Gold and Sulfur spawn near heated vents in the Graveyard region in eastern Proteus, and reaching that area requires you to unlock the Heat Tolerance adaptation first. You earn adaptations by interacting with Angel Combs scattered across the ocean, which permanently alter your DNA to grant new survival abilities.
The alternative recipe tab inside the Processor typically unlocks once you scan and discover both Gold and Sulfur in the wild. If you have not unlocked Heat Tolerance yet, stick with the Necrolei Cyst route. It is faster, more accessible, and repeatable with zero adaptation requirement.
Tips for Farming Strong Acid Efficiently
- Beacon the Stilt Orb field immediately: The plateau west of the Old Habitat is the most reliable respawn zone. A Beacon there means you never waste time searching again.
- Queue multiple batches at once: After selecting your recipe, press Load Processor repeatedly to fill the queue. Walk away and return to a full output bin.
- Build your base near the Lifepod: Keeping your Processor close to your main storage cuts down significantly on travel time between harvesting runs and crafting sessions.
- Carry the Repair Tool on harvesting trips: Aggressive fauna near the Old Habitat can damage your gear, and patching up on the spot keeps your dive productive.
- Pair a Metal Farm with your Processor base: Passive ore duplication keeps Titanium and Copper Wire stocked so your base expansion never stalls while you focus on Strong Acid production.
- Keep oxygen in mind: The Stilt Orb field sits around 25 to 35 meters depth, which is manageable with the standard tank, but upgrading to a High Capacity Air Tank gives you far more time to harvest without surfacing constantly. Play Now!
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