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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.

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  • Currently 5.0/5
(1 votes)
Title: Digging Deep
Air Date: September 2, 2020
Runtime: 60 min

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