TL;DR
- Acidic Raion Pouches come from the Acid Raion — a large purple, brain-shaped plant found in underwater caves near your Lifepod.
- You need the Survival Multitool to harvest them. You cannot pick them up by hand.
- Always remove the pouches before taking the Medical Gel Sac — the plant releases acid when the Sac is taken first.
- Each plant gives up to 3–5 pouches per harvest.
- The most important use is crafting the Basic Battery, which powers the Scanner, Flashlight, Habitat Builder, and Wakemaker.
- Acid Raion plants respawn over time, so the cave below your Lifepod is a reliable long-term source.
The Acidic Raion Pouch is one of the first resources you need to find in Subnautica 2. Without it, you cannot craft a Basic Battery. Without a battery, you cannot build a Scanner. Without a Scanner, your blueprint progression stops entirely. This single resource is the gateway to most of your early crafting.
The good news is that it is right underneath your Lifepod. This guide explains what the Acid Raion plant looks like, exactly where to find it, how to harvest the pouches safely, and every recipe that uses them.
What Is the Acidic Raion Pouch?
The Acidic Raion Pouch is a harvestable material cut from a plant called the Acid Raion. The plant is large and hard to miss once you know what you are looking for. It has bright purple, wrinkled leaves that look a lot like a cluster of brains. In the center of the plant sits a green bulb — that is the Medical Gel Sac. On the sides of the plant are the three large purple pouches — those are what you need.
The plant does not attack you, but it does have a defense mechanism. If you try to take the Medical Gel Sac before removing the pouches, the plant releases a burst of acid that deals damage. Always harvest the pouches first.
What You Need Before You Can Harvest It — The Survival Multitool
You cannot collect Acidic Raion Pouches empty-handed. You need the Survival Multitool equipped to cut the pouches free. The blueprint for the Survival Multitool is unlocked from the very start of the game, so it should be one of the first things you craft.
Survival Multitool recipe: 3x Titanium → craft at the Lifepod Fabricator
Titanium is scattered across the ocean floor all around your Lifepod. Pick up three pieces, head to the Fabricator, and craft the Multitool before you go looking for the Acid Raion. Without it, you will swim to the plant and have nothing to show for the trip.
Where to Find Acidic Raion Pouches — Best Early Locations
Location 1 — The Cave Directly Below Your Lifepod (Easiest)
The fastest and most reliable early source is the cave directly underneath your Lifepod. Swim straight down beneath the pod and look for an opening in the ocean floor. Drop inside. You will find Acid Raion plants growing on the cave walls and floor, alongside Copper deposits on the rock surfaces.
This cave gives you two critical resources in one dive — Copper for the battery recipe and Acidic Raion Pouches for the same recipe. Do both in a single trip. Watch your oxygen on the way back up and bring an Air Bladder if you have one.
One thing to watch out for: there are toxic gas clouds near some of the plants in this cave. Move quickly after harvesting and do not linger near the plants longer than needed.
Location 2 — Underwater Caves Throughout the Starting Area
Acid Raion plants appear in underground caves and rock formations across the entire starting biome around your Lifepod. Look for holes and openings in the ocean floor and swim into them. Most caves in the early area have at least one or two plants.
As you swim further from your starting point, the caves get richer and the plants become more common. Once you have Basic Fins and a bit more oxygen capacity, a sweep through nearby cave systems fills your inventory with pouches quickly.
Do Acid Raion Plants Respawn?
Yes. Acid Raion plants respawn over time after you harvest them. The cave below your Lifepod remains a usable source for the entire early game. You do not need to discover new locations every time you need more pouches — just return to familiar caves and harvest again.
How to Harvest Acidic Raion Pouches Safely — Step by Step
- Craft the Survival Multitool at your Lifepod Fabricator (3x Titanium).
- Swim to the cave below your Lifepod or any nearby cave with Acid Raion plants.
- Equip the Survival Multitool from your hotbar.
- Approach the purple brain-shaped plant and get close enough for the interaction prompt.
- Right-click to Cut Acidic Raion Pouch. Each press removes one pouch. Continue until all side pouches are gone — each plant gives you 3 to 5 pouches.
- Only after all pouches are removed, pick up the Medical Gel Sac from the center stem. At this point the acid release has been neutralized and it is safe to take.
If you accidentally try to take the Gel Sac first, the plant blasts you with acid. It hurts but is not lethal in shallow water. Just back off, wait a moment, and try again with the Multitool on the pouches.
What Is the Medical Gel Sac and Should You Take It?
Yes — always take the Medical Gel Sac after you harvest the pouches. It is the green bulb at the center of the plant and you can collect it by hand once the pouches are removed. The Gel Sac restores 10 health on use without needing a Fabricator, making it a useful emergency heal in the early game. It is also a crafting ingredient for more advanced First Aid Kits later on.
Do not leave it behind. It is free healing that costs you nothing to collect.
What Is the Acidic Raion Pouch Used For?
The Acidic Raion Pouch shows up in several important early crafting recipes. Here is every recipe it feeds into:
Basic Battery (Most Important)
Recipe: 2x Copper + 1x Acidic Raion Pouch → craft at Fabricator → 1x Basic Battery
The Basic Battery is the most critical use for this resource. It powers every early tool in the game. The Scanner, Flashlight, Habitat Builder, and Wakemaker all require a Basic Battery to build or to operate. Without this recipe, your progression in Subnautica 2 stops immediately.
Craft multiple batteries at once whenever you have enough materials. You will always need more — tools drain battery charge over time and need to be recharged by swapping in a fresh one. Keep a stack of charged batteries in your inventory at all times.
For a full guide on the Scanner — the first tool you should build with your battery — check out how to craft the Scanner in Subnautica 2.
Mild Acid
Recipe: 2x Acidic Raion Pouch + 1x Copper → craft at Fabricator → 1x Mild Acid
Mild Acid is an intermediate crafting material used to build the Processor and the Biolab base modules. The Processor is particularly important — it lets you refine raw materials into ingots and opens up alternative crafting recipes including alternate Water recipes. You will need Mild Acid before you can build either of these base stations.
There is also an alternate Mild Acid recipe available at the Processor once you have built one, using 2x Acidic Raion Pouch without Copper, but the Fabricator recipe is how you get your first batch.
Grease (Alternate Recipe)
Grease can be crafted using Lucifer Rotsac as its primary recipe, but Acidic Raion Pouches feed into the broader chain of materials that leads to Grease production. Grease is required to craft the Wakemaker, your most important early swimming speed upgrade.
For more on getting faster in the water, check our guide on how to swim faster in Subnautica 2.
How Many Acidic Raion Pouches Do You Need?
In the early game, here is a rough count of what you need for core progression:
- 1x pouch for the first Basic Battery (Scanner)
- 1x pouch for the second Basic Battery (Habitat Builder)
- 1x pouch for the third Basic Battery (Wakemaker)
- 2x pouches for Mild Acid (Processor and Biolab)
- Additional pouches for recharging tools and crafting spare batteries
In practice, collect 10 or more pouches on your first proper cave dive. The cave below your Lifepod usually has 2–3 Acid Raion plants, each giving 3–5 pouches. That is more than enough to cover everything above in one trip.
Tips for Efficient Acidic Raion Pouch Farming
- Always bring the Survival Multitool. There is no substitute. Without it you cannot harvest a single pouch.
- Harvest pouches before the Gel Sac every time. The acid release is avoidable if you do things in the right order.
- Combine your Copper and Pouch runs. The cave below the Lifepod has both. One dive gives you everything for multiple batteries.
- Craft batteries in batches. If you have 6 pouches and 12 copper, craft 6 batteries at once rather than one at a time. They do not expire and you will use them all.
- Return to the same caves. Plants respawn. You do not need to find new caves every time you need more pouches.
- Watch your oxygen in tight caves. The cave below the Lifepod is not deep but it can catch you off guard. Keep an Air Bladder on your hotbar.
More Early Game Guides for Subnautica 2
- What to build in your base first — Priority order for base structures and equipment.
- How to unlock the Habitat Builder and start building a base — Fragment locations and full recipe.
- Where to find Copper in Subnautica 2 — The other ingredient in the Basic Battery recipe.
- How to unlock blueprints and crafting recipes — How the full progression system works.
- How to make water in Subnautica 2 — Stay hydrated during early resource runs.
- Best early food sources in Subnautica 2 — What to eat once you unlock digestion.
- How to cure Digestive Incompatibility — Fix your food problem early.
- How to get the Flashlight blueprint — Useful for exploring dark caves where Acid Raion grow.
- Fix the Fabricator error in Subnautica 2 — If crafting is not working as expected.
- How to release Lifepod clamps — One of the first tasks after landing.
- Best early upgrades and progression path — What to prioritize after you have your first battery.
- Subnautica 2 multiplayer co-op guide — Play and gather resources with friends.
- Subnautica 2 beginner tips and tricks — Full new player survival guide.
- Subnautica 2 PC requirements — Check if your system can run it.
- Subnautica 2 release date, platforms, and price — Everything about where to play.
Get Subnautica 2 on Steam or play via Xbox Game Preview during Early Access right now.
