The Church of Spiritual Technology (CST), part of the Church of Scientology's corporate structure, owns and operates several mysterious vaults, said to hold copies of L. Ron Hubbard's writings and lectures. These are some of the most secretive of Scientology's properties, and so far, there have been few tours to outsiders and few vault staff who have left CST and told their version of what goes on inside these locations.[1] The vault locations frequently have an aerial marker of CST's double circles and diamonds logo.
The titles to at least some of the vault properties are held by Mile High, Inc, a wholly-owned subsidiary of CST.