FIELD: mining industry. SUBSTANCE: method involves providing mobile unit to working site; attaching hinged tubular liquid nitrogen evaporator to ground support by means of C-clamps and anchors; fastening tarpaulin web on evaporator; positioning inert foam or foamed hardening suspension generator at side adjacent to space to be isolated; supplying liquid nitrogen to evaporator or delivering liquid phase to apparatus. Method allows safety of work to be provided by utilizing fire area heat for gasifying of liquid nitrogen and due to remoteness of working processes from fire area. Method involves producing ice-rock web and snow mass. EFFECT: increased efficiency in extinguishing underground fire and improved safety of fire isolating works. 2 dwg
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