Ultra High Capacity Tank (Subnautica)

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 after retrieving its Blueprint from a Data Box. It boosts the player's Oxygen supply by 180 units.

The player must equip the Standard 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.