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" ... Laser-based tracking is also used to measure the constantly changing location of a TBM. It uses three main components: (1) a theodolite – effectively, a moveable telescope with an inbuilt laser – mounted onto the tunnel wall behind an advancing TBM; (2) a detector, installed on the back of the TBM – this is the target for the laser, and (3) a control unit that collects and analyses the data, and sends it to the control cab. This system provides the TBM pilot with a lot of vital information in real-time, including the distance traveled and the orientation of the cutter head. These can then be compared to the planned route. As the dig continues, with the tunnel often following a curving path, prisms are added to the walls – they deflect the laser around the curves and keep it pointing at the detector. Over larger distances, additional theodolites can be installed, providing a reliable reference chain for the TBM pilot to use for navigation. ... "