High Capacity O₂ Tank (Below Zero)
The High Capacity O₂ Tank is an upgrade to the Standard O₂ Tank that is crafted at the Fabricator.
While equipped, it boosts the player's maximum Oxygen supply by 90 units for a total of 135 units.
Stats
| Attribute | Value |
|---|---|
| Description | Highly Compressed breathable air. |
| Size | 6 slots (2×3) |
| Build Time | 5 seconds |
| Oxygen Bonus | +90 |
| Movement Penalty | -0.47 m/s underwater, -0.61 m/s on surface |
| Debug ID | doubletank |
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Acquisition
The blueprint is found in a Data Box located in the Twisty Bridges. The box is approximately 300-350m away from the Drop Pod, between South and South West, at a depth of about 120m. It is directly along the path between the Drop Pod and the beacon for Delta Station dock.
Note: Exact distance and direction vary between save files as the Drop Pod location is randomized within a small area in the Shallow Twisty Bridges.

Location Coordinates:
- Twisty Bridges: (-253, -124, -250)
To benefit from the upgrade, the player must equip the High Capacity O₂ Tank in the tank slot of the PDA Inventory Screen. While not equipped, it takes six slots (2×3) in the inventory.
Crafting
Recipe
The blueprint is unlocked by opening a databox in the Twisty Bridges. It is crafted in the Fabricator.
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Uses in Crafting
Modification Station
Used to craft:
- Ultra High Capacity Tank: Requires 1x High Capacity O₂ Tank, 4x Titanium, 1x Gold, 1x Lead Battery
- Booster Tank: Requires 1x High Capacity O₂ Tank, 4x Titanium, 1x Gold, 1x Lead Battery
Habitat Builder
- Habitat Builder: Requires 3x High Capacity O₂ Tank, 1x Titanium, 1x Lead Battery