- What to know
- Quick overview of the High Capacity Air Tank
- Where to find the High Capacity Air Tank blueprint
- Requirements before unlocking the upgrade
- Materials needed to craft the High Capacity Air Tank
- How to craft the High Capacity Air Tank
- Why the High Capacity Air Tank is important
- Oxygen progression comparison
What to know
- The High Capacity Air Tank increases your oxygen capacity significantly compared to the Standard Air Tank.
- You must unlock the blueprint from a data card found in deeper colony ruins.
- Crafting requires a Standard Air Tank and a Plasteel Ingot.
- This upgrade is essential for mid-game exploration and resource farming.
Oxygen management becomes one of the biggest challenges once you begin exploring deeper parts of Subnautica 2. The starter oxygen supply works well near the surface, but deeper caves, wrecks, and colony ruins quickly become dangerous without better equipment. The High Capacity Air Tank is one of the most important upgrades you can unlock early because it dramatically increases the amount of time you can safely remain underwater.
Quick overview of the High Capacity Air Tank
| Feature | Details |
|---|---|
| Item Type | Oxygen Equipment Upgrade |
| Unlock Method | Blueprint Data Card |
| Crafting Station | Fabricator |
| Main Benefit | Increased oxygen capacity |
| Recommended Progression | Early to Mid Game |
| Main Materials | Standard Air Tank, Plasteel Ingot |
Where to find the High Capacity Air Tank blueprint
The blueprint is located inside a ruined colony or research facility southwest of the starting Lifepod area. Players usually discover the upgrade while exploring deeper biomes connected to alien or abandoned human structures.
The region contains cliff drops, wreckage, and deeper cave systems, so preparation is important before heading there. Having basic mobility upgrades and emergency oxygen support makes the trip much safer.
Inside the structure, the blueprint is typically obtained from a recipe data card found on a desk or nearby container area.
Requirements before unlocking the upgrade
Before attempting the journey, it helps to already have the Standard Air Tank crafted and a small functional base with a Fabricator installed. Most players also benefit from bringing extra batteries and movement tools because the route involves extended underwater travel.
Materials needed to craft the High Capacity Air Tank
After unlocking the blueprint, you can craft the upgrade using the following materials:
| Material | Quantity |
|---|---|
| Standard Air Tank | 1 |
| Plasteel Ingot | 1 |
The Plasteel Ingot requires additional materials:
| Plasteel Ingot Recipe | Quantity |
|---|---|
| Titanium | 2 |
| Lithium | 1 |
Lithium is usually found in deeper biome regions near coral formations, colony ruins, and rocky cliff environments.
How to craft the High Capacity Air Tank
Step 1
Build or access a base with a Fabricator and Processor available.
Step 2
Gather Titanium and Lithium to craft a Plasteel Ingot.
Step 3
Open the Fabricator equipment menu.
Step 4
Combine the Standard Air Tank with the Plasteel Ingot.
Step 5
Equip the High Capacity Air Tank from your inventory.
Once equipped, your oxygen reserve increases immediately, allowing for much longer underwater expeditions.
Why the High Capacity Air Tank is important
The difference between the Standard Air Tank and the High Capacity version is extremely noticeable during exploration. With the upgrade equipped, you can spend far more time inside caves, loot larger wrecks safely, and explore dangerous areas without constantly surfacing for oxygen.
This upgrade also improves resource farming efficiency because you can complete longer collection runs before needing to return to safety.
Oxygen progression comparison
| Tank Type | Approximate Oxygen Capacity |
|---|---|
| Starter Oxygen | 45 |
| Standard Air Tank | 75 |
| High Capacity Air Tank | 120 |
The High Capacity Air Tank remains useful well into mid-game progression, even after unlocking better movement tools and vehicles.
The High Capacity Air Tank is one of the most valuable upgrades in Subnautica 2 because nearly every activity in the game depends on oxygen management. Exploring deeper zones, scanning structures, gathering rare materials, and surviving dangerous encounters all become easier once this upgrade is equipped.
Although reaching the blueprint location can be risky early on, the reward is absolutely worth the effort and should be considered a major progression milestone.
