China's Giant tunnel boring machines are used to excavate the ground using a circular cross section that drills through a variety of ground soil or rocky earth to produce subway tubes, tunnels for railways and many more.
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Sydney Metro Milestone: It's been 11 months since we last saw 'Nancy' the tunnel boring machine that drilled into the earth in Marrickville.
She was warmly welcomed to Martin Place this morning after an 11 kilometre dig.
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