In 2016 I was lucky enough to be invited to visit the new Crossrail station being built at Liverpool Street, 23 metres below the street. The giant burrowing machines had finished their work and the infrastructure was being installed. It was an awe-inspiring experience. Our group marvelled at the achievement of the designers, engineers and contractors who had created this extraordinary project below ground that seemed a worthy successor to the work of Brunel and Bazalgette in another century.