The Hellstone Storage Unit is an upgraded Storage Unit. As such, it serves as a container for a storage system, however, its content cannot be seen directly: instead, all the content from all connected Storage Units are seen together in the storage system's Storage Heart, a connected Storage Access, or a Remote Storage Access. Items are still technically stored in the Hellstone Storage Unit, however, and the unit is therefore protected from mining as long as it contains items. A Storage Unit Wand can be used to deactivate a Hellstone Storage Unit, allowing to empty it and then mine it, for example in order to upgrade it to the next tier, Hallowed Storage Unit.