Metro completes tunnel under Sydney Harbour

Kathleen the boaring machine on a barge in Sydney Harbour

Metro completes tunnel under Sydney Harbour

Tunnel boring machine (TBM) Kathleen is digging twin railway tunnels under Sydney Harbour as part of Sydney Metro – Australia’s biggest public transport project.

The specialised TBM is named after Kathleen Butler, who played a vital role in the construction of the Sydney Harbour Bridge, as technical adviser to engineer John Bradfield.

The project, which is an extension of the North West Metro line running to Bankstown, will be complete by 2024.

Premier Gladys Berejiklian said this is an engineering feat of historic proportions for our great city which will forever change how we get around Sydney.

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