Welcome to Gringotts, the largest wizarding bank. There are hundreds of thousands of millions of tunnels and passageways located under ground where all of the vaults are located. Run by goblins, they aren't very friendly creatures, but they get their work done efficiently. You are transported in a very fast moving carts that will take you to the specified vault. Becareful not to hurl onto anyone else around you, I doubt that would improve the goblins ill temper.
