Resumen
The article enlists the reasons of occurrence of environmental problems in the underground space of big cities, describes the origins of the negative influence of bio-corrosion in conditions of weak soils, gives characteristics of the influence of a negative state of bio-corrosion on the building constructions submerged info the ground and recommends the options of protecting the building structures from bio-corrosion, including constructive, sanitary & hygienic and chemical measures.