United Kingdom, Oct. 14 -- Balfour Beatty VINCI's enormous tunnelling machine broke through today, marking the completion of major tunnel excavation between London's Old Oak Common and the West Midlands on HS2's Birmingham approach tunnels.The 125-metre-long tunnel boring machine - named Elizabeth after the 19th century philanthropist Elizabeth Cadbury - was launched near the Warwickshire village of Water Orton in March 2024. It arrived at Washwood Heath this morning.Two identical machines were used to dig the 3.5-mile long Bromford tunnel that will carry high speed trains under the M6 and eastern outskirts of the city, with the first one - Mary Ann - breaking through earlier this year.Together, Elizabeth and Mary Ann have excavated more th...