
New. Railroaded: The project's most daunting challenge - tunnelling under Sydney Harbour - begins. At Martin Place, engineers juggle skyscraper construction above and station excavation below. S1 Ep3

New. 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. S2 Ep1

New. 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. S2 Ep1

New. Down and Dirty: We go back under Sydney Harbour to check out history in the making as the construction of the twin metro rail tunnels continues deep under the surface. S2 Ep2

New. Down and Dirty: We go back under Sydney Harbour to check out history in the making as the construction of the twin metro rail tunnels continues deep under the surface. S2 Ep2