The caverns for the two CBD stations on the project are to be excavated by six roadheaders. he station will be 240 metres long and 30 metres wide, with platforms about 36m underground.
Main tunnelling for the Metro Tunnel project will comprise twin 9km-long, 7m o.d. running tunnels tunnels will be constructed by TBM at a depth of up to 42m through a range of ground conditions, including rock, sands, clays and silt. The TBMs will also underpass two waterways: the Yarra River and Moonee Ponds Creek.
