We follow architect Ross de la Motte, seeing that his vision for the stations has finally come to light. He has gone to great lengths to design stations that benefit from natural light and airflow.
Another super challenge looms, perhaps the greatest of the entire project - digging two tunnels beneath Sydney Harbour.
Filmed over 5 years, this series will trace the enormous engineering challenges faced by what is the greatest public transport project in Australia's history: a brand new, state-of-the-art metro system through, beneath and above the streets of this iconic city of five million people.