A few miles outside town at the former Walker ranch is a by underground steel and concrete vault, built by the Scientology organization called Church of Spiritual Technology to hold "the wisdom of the ages." The Church owns over of land and the facility also includes a large caretaker's house and a guard house. The vault is one of several across the U.S. and is similar to Trementina Base. Prior to construction of this vault, on June 12, 1986, one of the oldest houses in the Petrolia area was deliberately burned by the Church of Spiritual Technology to clear the way for their construction, and symbols were cut in the ground above the vault to mark its location.