The Fed’s security workings are both intricate and surprisingly commonsense: a gold deposit, arriving via the street, is taken down to 80 feet beneath sea level via service elevator.
From that point, the gold becomes the responsibility of a control group of three people, one representative each from the Vault Services, Custody, and Auditing staff. A member of each of these three groups must be present whenever a compartment is accessed in the vault, even to change a lightbulb.