The Air Bladder is one of the first survival tools you can build in Subnautica 2, and it solves the most immediate problem on Planet Proteus: running out of air far from the surface. It is a hand-held flotation device crafted at the Fabricator inside your Lifepod, and once equipped it replenishes oxygen on demand.
Quick answer: Craft the Air Bladder at the Lifepod Fabricator using 2x Titanium and 1x Rubber (Rubber is made from Lucifer Rotsac). Equip it, then press F underwater to refill your oxygen. Refill the bladder itself by surfacing or entering a base or vehicle.
Materials needed for the Air Bladder
The recipe is short, and both ingredients are gathered within swimming distance of the starting Lifepod. Rubber is not a raw material in Subnautica 2 — you have to fabricate it from a plant called Lucifer Rotsac before you can build the bladder itself.
| Component | Quantity | Where to get it |
|---|---|---|
| Titanium | 2 | Dark crystalline nodes on the ocean floor near the Lifepod |
| Rubber | 1 | Crafted in the Fabricator from Lucifer Rotsac |
| Lucifer Rotsac | For Rubber crafting | Glowing orange/orange-red orbs on flower-like plants clustered around the shallows |
Lucifer Rotsac spawns in clusters, so a single sweep through the shallow biome around the Lifepod usually nets enough for several batches of Rubber. Titanium is also used in nearly every early recipe, so collect more than you think you need.
How to craft the Air Bladder
Step 1: Swim around the Lifepod and gather at least two Titanium nodes from the seabed. Pick up Lucifer Rotsac orbs from the flower-like plants on the same trip.
Step 2: Return to the Lifepod and open the Fabricator. Under the Resources menu, craft Rubber from the Lucifer Rotsac you collected.
Step 3: Still at the Fabricator, switch to the Personal menu and craft the Air Bladder using 1x Rubber and 2x Titanium. The finished item drops into your inventory and can be dragged onto your hotbar.
How to use the Air Bladder underwater
With the Air Bladder equipped on your hotbar, press F while underwater to consume a charge and instantly restore oxygen. The bladder deflates after each use and will not refill itself in the open water.
To recharge it, do one of the following:
- Swim to the surface.
- Enter a powered base (any room or corridor with a hatch).
- Enter a vehicle such as the Tadpole once you have one built.
You'll know it worked because your oxygen meter jumps up immediately and the bladder visibly deflates in your hand. If pressing F does nothing, the bladder is already empty and needs a refill at a safe area.
Where the Air Bladder fits in early oxygen management
Your character starts with 45 oxygen, which drains at about one point per second underwater. The Air Bladder is a fast emergency option, but it is not the only tool for managing dives. Pairing it with passive oxygen sources keeps exploration sustainable.
| Method | Effect | Cost / Requirement |
|---|---|---|
| Air Bladder | Instant oxygen refill on use | 2x Titanium, 1x Rubber; refill at surface/base/vehicle |
| Oxygen Tunic | Blue bubbles restore oxygen on contact | Free; found on the ocean floor |
| Standard Air Tank | Raises maximum oxygen to 75 | 2x Titanium, 2x Silver, 1x Rubber |
| Powered base or Tadpole | Replenishes oxygen while inside | Habitat Builder / Tadpole construction |
Swimming between Oxygen Tunic plants is the cheapest way to extend long dives, and the Air Bladder is best treated as a panic button rather than your primary oxygen plan. Once Silver becomes available, the Standard Air Tank is the more permanent upgrade.
Common reasons the Air Bladder fails to refill oxygen
If the tool isn't behaving as expected, the cause is usually one of these:
- It is not assigned to a hotbar slot, so the F key does nothing.
- It has already been used and not yet refilled at the surface, a base, or a vehicle.
- You are inside a base or near the surface, where the prompt won't trigger because oxygen is already restoring.
Once both the Air Bladder and a Standard Air Tank are in place, the early game opens up considerably, letting you push deeper to scan blueprints, gather Silver and Lead, and unlock the Digestion Adaptation that lets you eat native fish and flora.