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Tunnelling almost 50% complete for Sydney Metro

Tunnelling for the Sydney Metro Project is almost half complete, with another tunnel boring machine (TBM) breaking through at the Crows Nest Station site.

Tunnelling for the Sydney Metro Project is almost half complete, with another tunnel boring machine (TBM) breaking through at the Crows Nest Station site.

TBM Mabel’s arrived at the site after tunnelling for around three kilometres from Chatswood, four weeks after TBM Wendy arrived.

The machine had been launched in February and has excavated around 290,000 tonnes of sandstone and shale, enough to fill 45 swimming pools.

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TBM Mabel will undergo maintenance at the Crows Nest site before it is relaunched towards the future site of the North Sydney station.

The two TBMs are building 6.2 kilometres of tunnel to link the North West Metro at Chatswood to the harbour’s edge at Blues Point.

The machine is named after Mabel Newill, a matron at the Royal Prince Alfred Hospital who introduced sanitisation techniques to help stop the spread of typhoid in Sydney in the early 1900s.

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