The article presents the results of the evaluation of design and technological risks when considering the project of water-saturated soil mass stabilization in order to prevent the settling of the earth's surface at the emergency site between Lesnaya and Ploschad Muzhestva stations in the period from 2005 to 2016. The analysis of the main causes of the emergency at the site under consideration was performed. Different options for the array stabilization using the space grouting inside the flooded tunnels were presented to solve the problem. The geophysical surveys indicate that the processes in the "tunnel-array" system are far from stabilization. The purpose of research and scientific works is to determine the causes of the accident and the forecasting of negative phenomena in the "array-flooded tunnels" system, the rationale of choosing the most economically feasible, effective and safe way of operations. The problem of quantifying the risks for the options of the implementation of the flooded tunnels plugging project was solved. The existing approaches to risk assessment, applied in the world practice were considered, the main content of the risk management process was revealed.
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