In case of TBM drives with liner segments this theme allows the documentation of the built in liner segments. The documentation includes type of liner segment used, exact position in tunnel, serial number of segment etc. For each liner segment data coming from the TBM - process data theme can be displayed; statistical values of the process data for of each liner segment are automatically calculated. Damages found on liner segments can be documented in 2doc together with a damage classification, a verbal description and optional photos. The liner segment documentation yields valuable information especially when used in combination with data coming from other themes i.e. Subsurface 3D Displacement Measurement or Geological Documentation.