This is what I don't get. Vault-Tec must have known the nukes were going to drop sometime or later. So, they use the vaults to cover for the experiments (Which again, they must knew about the nukes or else they would just be building normal vaults and not experiments). But who's going to use the info after the world's destroyed? Did all the vault-tec leaders have their own vault where they monitored the experiments, wait a couple of hundreds of years, and then use the data gained from the vaults to do... whatever? If some were supposed to last only 100 years then why don't we see their impact in the games that happen many years later?
I bet some of these questions are answered if I just play 4.