The first mega borer tunnelling under the centre of Sydney has finished work with the historic journey coming to an end at the new Barangaroo Station site.
Tunnel Boring Machine (TBM) Nancy broke through a wall of sandstone, marking the end of a 15-month excavation to deliver Sydney’s newest metro railway tunnels.
Since launching from Marrickville in October last year, Nancy has tunnelled through 8.1 kilometres of sandstone and shale in a spectacular engineering feat deep under the centre of Sydney.
Along the journey the TBM has excavated more than 821,000 tonnes of rock – enough to fill 126 Olympic swimming pools.”
Nancy tunnelled through new metro railway station sites at Waterloo, Central, Pitt Street and Martin Place before arriving at Barangaroo, leaving behind a concrete lined and waterproofed railway tunnel.
TBM Nancy is named after transport pioneer Nancy-Bird Walton OBE, who was the Commonwealth’s first female pilot to carry passengers and founder of the Australian Women Pilots' Association.