These store iron and water in your base. The higher your Central Computer the more of them you can build in your base. Upgrading them makes them able to store more resources, and is a requirement of upgrading your Central Computer. Protect them well as rival players will target these buildings in order to steal your resources.
|Build iron & water ^||21,005||59,695||190,020||539,540||1,700,065||4,895,095||10.2M|
|Build time||1h 41m||2h 31m||3h 46m||5h 41m||8h 31m||12h 46m||15h 24m|
The same amount of each resource is required for all levels of storage building.