TWO years and five months after it began its five-mile drive, creating one of the twin bores of HS2’s Northolt Tunnel West, tunnel boring machine (TBM) Sushila was brought to the surface in mid-March.
Named after Greenford High School teacher Sushila Hirani, known for her work in inspiring girls to study science, technology, engineering and mathematics (STEM) subjects, the 2,000-tonne, 140-metre (460 feet) long machine was launched on October 6, 2022 – the first of six TBMs to begin work on HS2’s tunnels under London. Its counterpart Caroline (named after astronomer Caroline Herschel) was launched later the same month, to drive the second bore of the tunnel.
Excavation
Both began their journeys at West Ruislip, with a destination of Green Park Way, Greenford, where the tunnel joins end-on to the…
