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(VIDEO) Watch 1980s tunnel builders tackle a challenging crossing of iconic Sydney Harbour

Traffic congestion around Sydney Harbour in Australia forced community leaders in the late 1980s to build a new route across the iconic waterway. A combination of bored tunnels, cut-and-cover, and immersed tube construction proved to be the solution. Here's a 1990s-era film showing the planning, construction, and completion of the Sydney Harbour Tunnel.

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