Ultra High Capacity Tank (Subnautica)

The High Capacity Tank is a piece of equipment and an upgrade to the regular Tank. It is crafted by using the Modification Station.

It boosts the player's oxygen supply by 60 seconds. This is twice as much as a regular tank.

The player can carry multiple tanks at a time to further increase their oxygen capacity. The High Capacity Tank also takes up four slots in the player's inventory.

The player can carry maximum of 12 High Capacity Tanks if the inventory is cleared first. This will boost the player's oxygen supply by 720 seconds (12 min).

(As of update B55, the High Capacity Tank does not affect player speed.)