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Abstract: The WestConnex M4-M5 Link Tunnels (WCX Stage 3A) project is a 7.5 km Sydney underground link connecting the WestConnex M4 East Tunnel at Haberfield and the WestConnex New M5 (M8) Tunnel at St Peters Interchange. The project commenced in June 2018 and is due for completion in 2023. The project comprises 21.6 km of roadheader tunnel excavation, tunnel civil fit out works, surface civil works,...