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This item is late-game content: a deep biome, a leviathan or part of the story. It stays hidden until you choose to see it.

Ion cube
Raw materials

Ion cube

High capacity alien energy source.

How to get

Used in (4)

Blue tabletIon batteryOrange tabletPurple tablet

Databank

Ion Cube

This green mineral substance has no entry on the periodic table, and an unprecedented ability to store huge amounts of ionic energy within it.

- Likely grown artificially - Cubic appearance suggests it has been cut from a larger deposit - Each cube contains the equivalent ionic energy of 5 kilotons of TNT - Under the right conditions the energy could be released in a controlled manner - Likely used as batteries, but would require a substantial power source to be recharged

Assessment: Valuable energy source

Subnautica data: build 83031 (Oct 2025)