The $17,7 Billion Mega Project That’s Changing London Forever | Blueprint

Building a brand-new railway under one of the world’s busiest cities is no easy task. The £14 billion ($17,7 billion) Crossrail project is tunneling 42 kilometers through London’s dense underground maze, weaving past ancient tunnels, power lines, and historic foundations with incredible precision. With gigantic tunnel boring machines working 24/7, this is one of the most ambitious engineering projects of all time. How did they do it?

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