Tunnel boring machines (TBMs) Betty and Dorothy are progressing well on their journey to carve out a section of the twin
Sydney Metro West tunnels between Sydney Olympic Park and Westmead.
They have already built 865 metres and 300m, respectively, of fully lined tunnels since launching from the Clyde launch box.
The 1200-tonne machines are tunnelling approximately 180m a week and are expected to complete the first 4.5-kilometre leg of their journey and arrive at Sydney Olympic Park in mid-2024.
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