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High Capacity Air Tank

The upgraded oxygen tank in Subnautica 2: the High Capacity Air Tank pushes you to 120 seconds of air.

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Verifiedfor Current version
Checked by HostedGG Team on Jun 18, 2026
Updated 3 months ago
Item
High Capacity Air Tank
Oxygen
+75 (120 total)
Recipe
Standard Air Tank + Plasteel Ingot

The High Capacity Air Tank is the mid-tier oxygen upgrade, adding 75 seconds for a total of 120. You craft it at the Fabricator from a Standard Air Tank and a Plasteel Ingot, and you unlock the blueprint from a Recipe Data Card found at the Spires Wreck or the Cicada Wreck. Beyond it sits the Ultra High Capacity Air Tank for the deepest dives.

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