Tags: Tunnel Boring Machines

Breakthrough! HS2 completes excavation of huge 8.4 mile tunnel under the capital

27th June 2025

Construction of Britain’s new high-speed railway has passed a major milestone with excavation of the 8.4-mile Northolt Tunnel under London. The fourth of four tunnel boring machines (TBMs) being used to dig the twin-bore tunnel – the second-longest on the HS2 route between London and the West Midlands – completed its work yesterday. The machine, […]

HS2 tunnelling machines reach Chalfont St Peter ventilation shaft

14th March 2022

Two enormous Tunnel Boring Machines (TBMs) excavating HS2’s longest tunnels have completed the first stage of their drive – from the Chiltern tunnel’s south portal to the first ventilation shaft at Chalfont St Peter. HS2 this week confirmed that the two enormous 2,000 tonne tunnelling machines digging the high speed rail project’s tunnels under the […]