The Space Vault was a vault which orbited Skaro during the Age of Universal Peace. While the Daleks were confined to their planet during this era, the Vault contained all of their weapons, including their gunsticks, voltoscopes, sun laser tubes, and the Thunderizer.
When the Daleks were decided to be rearmed due to the threat of the Mechanical Planet, they were brought to the Space Vault to have their weapons returned to them. (COMIC: The Mechanical Planet [+]Loading...["The Mechanical Planet (comic story)"])