Subnautica Wiki
This article is about Ultra High Capacity Tank in Below Zero. Click here for information on this subject in Subnautica.
This article is about the Ultra High Capacity Tank. If this is not what you are looking for, click here.

The Ultra High Capacity Tank is a piece of equipment and an upgrade to the High Capacity O₂ Tank. It can be crafted at the Modification Station. It boosts the player's Oxygen supply by 180 units, increasing it to a total of 225 O2.

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

Equipping an Ultra High Capacity Tank incurs a movement penalty of 0.60 m/s underwater and 0.78 m/s on the surface. This is also the only tank that incurs a movement penalty for each one held in inventory: 1.21 m/s underwater and 1.57 m/s on the surface.


The blueprint for this item is unlocked by scanning Sea Monkey Nests located in the Lilypads Crevice and Arctic Kelp Caves. It is crafted in the Modification Station.

1x1 default bg.png
Modification Station Icon.png
Item Arrow.png
High Capacity O₂ Tank Icon.png
Lithium Icon.png

Item Arrow.png
1x1 default bg.png
Ultra High Capacity Tank Icon.png