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Watch Sydney's Super Tunnel Season 2 Episode 4 online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

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.