HS2 (High Speed Two) Ltd first TBM drive has passed the one-mile mark cutting through a mix of chalk and flint beneath the Chiltern hills just outside London.
Launched in May, TBM Florence is one of two identical machines excavating the twin 10-mile-long tunnels.
Align Project Director Daniel Altier said: “I am delighted with the progress that Florence has made since its launch in May, with Cecilia not far behind.
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