FIELD: warning devices. SUBSTANCE: method depends on installation of emergency mark on entity that has suffered accident; to this end, arbitrarily shaped envelope is filled with gas which is lighter than air, set of messages is chosen from graphic symbols and/or light, and/or sound, and/or radio- wave devices which are placed on emergency mark; then the latter furnished with warning device is lifted to altitude determined by emergency mark response range. EFFECT: improved capacity and promptness of informing about emergency situation. 4 cl, 1 dwg
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