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Watch Sydney's Super Tunnel Season 1 Episode 3 online. Maybe available on Youtube, Netflix, PrimeVideo, Hulu, Disney and other legal streaming platforms.

Another super challenge looms, perhaps the greatest of the entire project - digging two tunnels beneath Sydney Harbour.

In the early planning stages, the team actually considered dropping pre-fabricated tunnel sections down onto the floor of the harbour one by one, lowering them from barges, which was the way the road tunnel under the harbour was built.