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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...