Vault 108’s original purpose was to test the idea of conflict in leadership. Simply put, the Overseer of Vault 108 was meant to die shortly after assuming control of the vault with no one assigned to replace the Overseer, and no other positions of authority to remedy the situation. To add to this, the vault’s power supply was designed to malfunction after 20 years (with the vault intentionally sealed for 38). It doesn’t stop there, as Vault 108 was overstocked with weaponry and lacking in any forms of entertainment for the vault dwellers. Oh, and let’s not forget that it had a cloning lab for some reason.
This fact becomes important once the Vault Dweller of 2277 discovers and enters the vault during the events of Fallout 3. Once inside the rusted and deteriorated vault, you find the it filled with many hostile enemies. All of them clones. All of them named Gary. And as they charge you in the midst of their mad blood lust and hatred for all non-clones they have only one thing to say to you: “Gary.”
Gary. Gary. Gary.