Breakthrough

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With over 150 stunning photographs, explore how some of the deepest, largest and longest tunnels have been made in one of the most expensive underground building projects in a generation. Europe's largest infrastructure project has built over 42 kilometres of new tunnels under the capital in the first step towards a new railway for London and the South East. Teams of dedicated workers spent three years under the city to complete the tunnels, working with 1,000 tonne boring machines and the latest engineering technology.