Sydney’s Super Tunnel 1-3

Action Stations. The inside story of a crack team building a trailblazing, fully-automated metro system costing $50 billion, by far the biggest and most advanced new railway opening anywhere on the planet in 2019.

Great Expectations. An extension is now underway to get people into the centre of Australia's biggest city, including a new tunnel crossing deep under Sydney Harbour.

What Lies Beneath. Engineers encounter all sorts of issues while tunnelling through a minefield of pre-existing infrastructure.