鬼ごっこ: underChilterns
HS2 tunnelling machines complete first of 10 miles under the Chilterns
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Meet Florence and Cecilia: The 2,000-ton 555ft-long HS2 tunnelling machines that will dig 50 feet a day for three years as they complete first of 10 miles under the Chilterns for £100bn high-speed rail line HS2's hug...