Sydney's Super Tunnel - Season 2 Episode 1 -
Great Expectations
An extension is now underway to get people the rest of the way into the centre of Australia's biggest city, including a new tunnel crossing deep under Sydney Harbour. "From a construction point of view it's a nextlevel challenge - even bigger and more complex," says Sydney Metro chief executive Peter Regan.
Please explain the problem in a few words.
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Max 255 characters.