The second of two huge tunnel boring machines has started digging the HS2 tunnels that'll run under west London.The HS2 railway out of Euston will run through tunnels until they reach West Ruislip, when they pop up for a few minutes of daylight before dropping back into tunnels under the Chilterns.The long London tunnels are being dug in three phases, and the first phase is currently underway with tunnel boring machines starting work at West Ruislip and heading towards central London.
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