What would be its experiment? What would your companions say about it? What would there be to discover? Lore behind it? [spoiler] Vault 53 - Test mankind's ability to survive in a severely tight and enclosed environment without a possibility of escape -Any peaceful companions such as Preston or Piper could say something about the Vault being completely inhumane, while any sarcastic companions such as Cait or Deacon could say something under the lines of them not being afraid of the tight spaces but the Vault taking it way too far. - In the Vault, your player could find holotapes of Vault Dwellers going crazy and insane from them being claustrophobic, and the scientists saying that they never signed up for this. - The lore behind the Vault would be that Vault-Tec randomly picked 150 civilians of any nature, and then handpicked 50 civilians with known cases of claustrophobia, and put them in the Vault, with it supposedly being 'unbreakable' and the Vault was never suppose to open from the main entrance, but a secret entrance created for the scientists to come in and out was found by the civilians as they fought hard to make it out. The nickname the Vault was given was 'The Unbreakable' but that was short lived as a behemoth managed to smash the hatch down. [/spoiler]