Βefore we continue with vaults locations and keys we need to refer to some tips and information about vaults. First of all, after learning the vaults location you should know that in game map you will see some locks. When, in the vault location, you will not see locks, this means that they are already open and looted with the result, to save time and go straight to the next one. Lastly, the vault locations, on the other hand, will only appear on this map after you’ve discovered a vault key. Locks with a single keyhole require one key to open, while those with two require two keys.