🟩 Tunnel Boring Machines (TBMs) are assembled in the drive shaft, where excavation begins as the rotating cutter head advances through the ground. Excavated material is removed according to the TBM type, while tunnel lining segments are installed simultaneously to provide continuous support until the machine reaches the reception shaft. You can learn about all tunnel construction methods in our Online Tunnel Engineering Course (CPD Certified). Register today and take the opportunity to advance