Idk if this is ever explained, and forgive me if it is. But how does the institute get into vault 111? Sure Kellogg and Institute staff teleported in. But did they just blind teleport in? Ballsy considering they could have teleported someone partially into a wall or a container.
They only blind teleport that SS onto the roof of mass fusion. Which would be a lot easier than the underground vault. I guess they probably had schematics.
Maybe that's just how science works. Idk. I like to think it was just that it important to get Shaun.