Sydney’s Super Tunnel 1-3

Countdown To Launch. After almost 10 years of planning, building and involving more than 60,000 people from around the world, Australia's largest transport infrastructure project nears completion.

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.