Tunnelling for Sydney Metro complete under city centre. The only tunnel left to be created for the Sydney Metro is the second railway tunnel underneath Sydney Harbour.
https://www.roadsonline.com.au/tunnelling-for-sydney-metro-complete-under-city-centre/
Four out of five tunnel boring machines are now finished work for the Sydney Metro, with tunneling work 97 per cent complete.
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cover tunnel photo by: Matt Brown from London, England / CC BY
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