This article is about the High Capacity O₂ Tank. You may be looking for the Standard O₂ Tank, Lightweight High Capacity Tank or Ultra High Capacity Tank.
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This article contains information that is updated for the latest Experimental Version of Subnautica. Players using stable mode may find this information inaccurate.

The High Capacity O₂ Tank is an Equipment piece and an upgrade to the Standard O₂ Tank. It is crafted at the Fabricator. It can only be crafted after the player has acquired a Standard O₂ Tank. While equipped, it boosts the player's maximum Oxygen supply by 90 units.

The player must equip the High Capacity O2 Tank in the tank slot of the Paperdoll UI in order to benefit from it. While not equipped, it takes up 9 slots (3x3) in the inventory.

It can be upgraded into the Lightweight High Capacity Tank or the Ultra High Capacity Tank at the Modification Station.


TankGlassGlassTitanium×4Silver OreArrow-right (1)FabricatorArrow-right (1)High Capacity O₂ Tank


High Capacity O₂ TankPlasteel IngotArrow-right (1)Modification StationArrow-right (1)Lightweight High Capacity Tank
High Capacity O₂ TankLithium×4Arrow-right (1)Modification StationArrow-right (1)Ultra High Capacity Tank