The authors in this study briefly outline contemporary trends and the hierarchical construction of the models of surface and underground, horizontal tunnel networks, in the aspect of their optimization, accuracy as well as internal and external reliability. The developed modulartrilateral tunnel network is characterized by the elimination of the influence of temperature field on the measurement results, and also the resulting impact of the negative phenomenon of horizontal refraction occurring in the vicinity of the tunnel walls. Trilateration underground linear network with its specific advantages constitutes an alternative to traditional polygonal structures often used in the implementation of tunnel constructions. Simulation adjustment results and lateral coordinate deviations for the end points of the 10.5 km long network have been presented.