A huge 271.5 -tonne tunnel boring machine has begun its journey to construct a 2.2km tunnel beneath the River Thames, marking a major milestone for National Grid’s Grain to Tilbury project.
Weighing the equivalent of a fully loaded Boeing 777 aeroplane, the machine named Caroline was launched today by Energy Minister Michael Shanks. The TBM will excavate the tunnel that forms a critical part of the new infrastructure supporting the electricity network.