Based on the many years of experience of large megacities,the exploitation of underground modes of transport for over two centuries proves that the best type of modern urban transport is the underground.This work is aimed at solving the problems of surveying services in the construction of tunnels of the city subway,in particular,the orientation of an underground geodesic base via method of triangle connection in construction of city subway with counter – heading connections,on the example of the construction of a deep underground subway in the city of Kazan,Russia.The main goal of the master’s thesis is the calculation of the definition of the preliminary error and the error of closing the tunnels in the plan(along the axis)X,the preliminary calculation of the expected error of the cross slit in height Z(along the Z-axis)when orienting the underground workings via method of triangle connection,as well as the determination of the actual error of the closing of counter – heading connections after knocking them down by closing shots in a horizontal plane and comparison of the obtained results with the limit calculated according to preliminary calculations.The scientific novelty of the work is an effective technique for orienting underground geodetic networks in the construction of tunnels of a deep underground by counter-heading connections via method of triangle connection and a technique for efficient processing of measurement results with the possibility of an objective evaluation of the accuracy of the results.An increasing amount of information on the processes of mining production,the interrelationships and conditionality of their development is impossible without the use of cybernetics,system theories,economic-mathematical methods,computer technology,information-computing and automated systems.The system(complex)approach to the solution of problems of mine surveying and the use of precise quantitative methods and computer technology in the production of surveying work are the main components of the automation of surveying support of mining operations and create qualitatively new conditions for its implementation.Automation in mine surveying is not only an instrument of self-improvement,but also raises the entire production to a higher level.One of the most important directions in the development of the mine surveying system for production activities is the creation of a technical base that would make full use of the possibilities of electronic optical and computer technology,economic and mathematical methods,information technology to increase the efficiency of metering and control over mining operations and the validity of decisions taken.Another direction of the mine surveying system is the creation of mine surveying information support as an object of interpretation based on a data package that ensures the elimination of unnecessary duplication,cost reduction and the integrated use of once-collected data.