The personal office of the genius behind the Nuka-Cola Corporation and the Nuka-World amusement park, Bradberton's office is modest at first glance, but modesty was never a characteristic trait of the opulent beverage baron.
This is an office with a secret, which is to be expected. The entrance area is a reception that leads upstairs to a small, modest office. Bradberton's safe holds some loot and an interesting recording, but more importantly, it has a secret button on the right side of the vending machine that uncovers a secret elevator behind a bookshelf.
Use the elevator to discover a private Vault in the underground. Explore it to find... John-Caleb Bradberton, in the flesh. Or head. The Vault contains many artifacts of his past and future, including a secret prototype for a mini-nuclear munition, the Nuka-Nuke, and the original Nuka-Cola recipe.