atlanta bank she gets a little too curious. we re in closedown this evening, customers had left the bank, toddler walked off and walked into the vault just about the time the vault closed with its time lock. reporter: what comes next is a desperate attempt to free her. the vault doors aren t set to unlock until the next morning. there s only a nine-hour supply of oxygen in there. we want to make sure the toddler s safe, okay? that was the most important thing. reporter: with rescuers powerless to help, they called in a professional safecracker. he gets people out of jams like this for a living. police give him a high-speed escort to the scene. she was crying before i got to her. she was scared because of the drilling noise and all that. once i heard her crying, i knew everything was okay. reporter: he works for three hours while rescue workers manage to finally pump in fresh air through the vents and then with the help of a very large