Kathleen bores under Sydney Harbour

Posted on 06 August 2019

Sydney’s tunnel boring machine, Kathleen, has begun drilling under the Sydney Harbour bridge for Sydney Metro. The machine is currently 30 meters below ground level and will go as deep as 40 meters as it progresses through.

This is one of two tunnels that are to be drilled under the bridge using sophisticated tunneling technology to navigate through clay, rock and sediment. The first tunnel, which will be around 130 long, is expected to take four months to complete.

This particular machine is named after Katherine Butler, who was heavily involved in the original construction of the bridge as a technical advisor.

The recently opened Rouse Hill to Chatsworth line has gained a significant amount of traction, with reports that 20,000 fewer vehicles travelling on the M2 toll road in the North of Sydney last month compared with the same period a year prior. Premier Gladys Berejiklian anticipates that these numbers will rise as locals begin to see the benefits of the new transport,

“Once people see how the system is working and how much they can save both in time and dollars … I think we’ll see those figures go up,” she said.

“We have always known that the real potential of the congestion busting in terms of the road network will happen once this [second] part of the project is done.”


Pictured: Premier Gladys Berejiklian

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