The Bank Job

You are a group of well-informed thieves. You found out that the general manager of Central Bank has a stash of diamonds hidden in his office.
Under the cover of night you sneaked into the bank and reached the office of the manager's assistant, from there you deactivated the alarm, but it will sound off in exactly one hour.
If you get to the diamonds in one hour you will be rich beyond your wildest dreams, if you don't you will end your career in jail.