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UK High Speed 2 TBM Cecilia breaks through after boring the longest tunnel of HS2 project at Chiltern Hills

    Kris Lubcek
    By Kris Lubcek Replies (1)

    This is my 5 cents for tunnel breakthroughs;

    The second giant boring machine (TBM) building HS2 under the Chiltern Hills broke through at the tunnel’s northern portal, completing a journey that began in June 2021.

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