Subnautica 2 Oxygen Guide (How to Increase Oxygen & Survive Longer)

Okay, so in Subnautica 2, running out of oxygen is a huge deal when you first start. Seriously, getting more time underwater is a game-changer. It lets me explore way further, scan stuff faster, and just generally makes things a lot smoother. You really need to think about your oxygen when you’re checking out those underwater buildings and heading into the deeper parts of the map – having a solid plan for how to manage it is key to survival.

Best Early Oxygen Upgrades & Tips

Oxygen is initially the game’s core exploration limiter. Address it by taking these actions:

Prioritize crafting Air Bladders and a Standard Air Tank.
Always look for Oxygen Tunics, blue plants that emit oxygen-refilling bubbles, when exploring.
Activate the Oxygen Control Biomod.
Improve your mobility with Fins and Biomods.
Use vehicles and simple bases as places to refill oxygen during deep exploration.

Craft Air Bladders as Soon as Possible

You can create Air Bladders with your Fabricator right at the start of the game. When used, they quickly restore 25 oxygen, and they automatically recharge whenever you swim to the surface or touch bubbles from an Oxygen Tunic. It’s a good idea to make at least one as soon as you can, and because they don’t require many materials, you can easily craft several to explore further.

Titanium is found on the ocean floor around your Lifepod. You can craft Rubber once you’ve discovered Lucifer Rotsac – bright orange spheres that are fairly common early in the game.

Prioritize Making a Standard Air Tank

Getting a Standard Air Tank immediately increases your maximum oxygen by 30, making it a crucial item to craft early in the game. The biggest challenge is finding Silver, which can be difficult at first. If you’re having trouble, search for Silver nodes in deep caves about 150 to 200 meters north of your Lifepod.

Don’t use any Silver you find on tools or electronics until you’ve built a Standard Air Tank first.

Use Oxygen Tunics During Exploration

Oxygen Tunics are large, blue plants that grow on the ocean floor. When you touch the bubbles they release, they restore your oxygen supply. It’s smart to keep an eye out for these plants and plan your dives around them. They can also recharge your Air Bladders, giving you more air.

Activate the Oxygen Control Biomod

Bring a Basic Battery to the Welcome Center (located 85 meters southeast of your Lifepod) and put it in the terminal near the NOA. This will power up the Biolab inside, allowing you to activate Biomods. One helpful Biomod is Oxygen Control, which reduces your oxygen use when you’re stationary – it’s great for scanning, building, or managing your inventory while underwater.

Vehicles Help Solve Oxygen Problems

Vehicles are essential for exploring the underwater world because they provide unlimited oxygen. They let you reach places that are difficult to swim to and act as a safe base where you can replenish your oxygen supply. For instance, you can position your vehicle near a sunken structure, explore inside while collecting data and resources, and return to the vehicle for air whenever you need it.

Okay, so you really need to think about your oxygen situation when you start exploring those deeper areas. Seriously, your oxygen goes down fast down there! That’s why having a vehicle with an oxygen refill system is a lifesaver – it’s just so helpful to have that mobile refill station with you.

Bases and Beacons Improve Oxygen Management

Once you have a Habitat Builder and enough Titanium and Quartz, you can create bases to help with oxygen supply, much like setting up refueling stations for vehicles. All you need to do is build a room, connect a hatch, and power it up. These bases don’t need to be complex – they can simply serve as oxygen refill points, and you can use beacons to mark their locations for easy finding.

Movement Upgrades Reduce Oxygen Pressure

Better movement doesn’t directly give you more oxygen, but it helps you use what you have more effectively. This means you can travel further between Oxygen Tunics, or get back to the surface, before your oxygen runs out. Here are a few movement upgrades that are useful early in the game:

You can make Fins in your Fabricator to get a small speed boost.
You can power up the Welcome Center (85m south-east of the Lifepod) and use the Biolab inside to activate the Dash and Sea Skimmer Biomods.
You can eventually make a Wakemaker in a fully functional Fabricator, which improves your underwater maneuverability.

Avoid These Common Oxygen Mistakes

As you get better gear throughout the game – things like new bases and vehicles – it really opens up the world for exploring. But honestly, when you’re starting out, there are a few oxygen-related things you really want to avoid messing up. I learned the hard way, and I want to help you skip those early frustrations!

Don’t Explore Too Deep Too Early

Okay, so I’ve learned the hard way that you really need to watch your oxygen when diving! Basically, don’t go too deep until you’ve figured out how to manage your air supply. Luckily, I’ve found a bunch of these awesome things called Oxygen Tunics in the caves near where I crashed – the Lifepod. They let you breathe underwater, so I can explore without needing any special gear. It’s a lifesaver, honestly!

Watch Oxygen Before Entering Structures

Large underwater structures can be easy to get lost in, so make sure you have plenty of oxygen before going inside. On your first visit to a structure, prioritize finding a way to refill your oxygen – you might discover a hidden Oxygen Tunic or a room where you can reach the surface for air.

Don’t Panic if You Run Out of Oxygen

Running out of oxygen can be frustrating, but thankfully, you won’t lose your items. So, even if you start to suffocate, try to remain calm – the consequences aren’t severe.

2026-05-14 22:07