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The paper presents a review of influence exerted by subsurface microbiota on hard rocks in the underground space of megalopolises. It describes main strategies used by microorganisms to attach to different mineral surfaces, considers natural and technogen-ic conditions, under which microbiota develops in the underground medium. Particular attention is given to the presence of aquifers with different chemical composition and contamination level, natural occurrence of organic layers in the rock section, urban source...

This paper analyzes the causes of groundwater breakthrough occurred during the excavation of deep pit in the central part of the city at the territory, which was being developed since the 14th century. Particular attention is paid to historical aspect of this area contamination and its impact on negative transformation of the underground space components such as soils, groundwater, gases, and microbiota. It is shown that the specificity of hydrodynamic and hydrochemical conditions has fundamental importance for as...