Sydney’s Super Tunnel – Season 2

Testing Times. After the completion of 30km of tunnelling, workers prepare to build railway stations, lay tracks and test driverless trains.

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

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.