A relative latecomer to the Corporations, Neumann was a small company built by a bored megarich executive around this facility, an empty space occupied only by at-the-time advanced nanonic assemblers with one task; to copy itself, and to improve itself every time. One day, the Vault would be opened, and whatever was inside would be The novelty of the offering amused many of the idle megarich, and money flowed in, soon powering it to the status of a moderate Corp. They built other divisions and started work, and soon forgot the assemblers in the vault over newer, more advanced models. They ran into money trouble, and were prepared to open the Vault to see what they had cooked up in desperation, and this so worried the Goldmarck Corp, another high-level corp mostly specialising in nanonic assemblers, that they declared a Private War, at first subtle, then more and more overt. By the end of it, just four weeks after it had begun, both corps were utterly destroyed, and the Vault soon forgotten as the Fall of the Corporations came a bare month later, befor the radiation had cooled enough to send in even hardened 'bots.
Decades later, the Vault still lies unopened, its work going on far longer than even the Neumann Corp had planned. Anything could be in there now, a mist of dead nanites self-coded into deactivation, assemblers capable of rearranging the universe on the subatomic level, a vast array of pretty and meaningless junk, built to please the eye of a nanite swarm gone Smart, or nothing, the assemblers improving themselves beyond the constraints of the universe.