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Giant caverns beneath Sydney’s north shore mark finish line for new harbour crossing

Patyegarang will soon tackle a 200-metre stretch of clay, silt and sand as crews push toward the project’s late-2028 opening.

The first of two giant boring machines tunnelling under the harbour is about to start the riskiest part of the motorway project, carving through soft ground.

4 Articles

Sydney Morning HeraldSydney Morning Herald
+3 Reposted by 3 other sources
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Giant caverns beneath Sydney’s north shore mark finish line for new harbour crossing

The first of two giant boring machines tunnelling under the harbour is about to start the riskiest part of the motorway project, carving through soft ground.

·North Sydney, Australia
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Sydney Morning Herald broke the news in North Sydney, Australia on Tuesday, November 3, 2026.
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