combustion and absorbs a tremendous amount of heat from the burning coal application_number US 201113082823 A description the present invention uses carbon dioxide in gaseous and liquid form these substances are injected into a subterranean volume that has been sealed or at least sealed as perfectly as possible it is not necessary to use the largely pure carbon dioxide that presently results from industrial gas production instead it is possible to use stored combustion exhaust products one example is to harvest carbon dioxide from coal fired electrical generating plants this impurities contained in this gas such as sulfur nitrogen and even some oxygen are often removed at the point of emission using scrubbers etc relatively pure carbon dioxide is thus produced and this is preferred for the present invention however even carbon dioxide containing significant impurities can be used for the present invention though its use may affect the monitoring process as will be explained subsequently fig5 shows a subterranean mine as previously shown in fig2 the location of combustion face 14 is initially determined and a plan to fight the fire is formed a subterranean volume containing the fire is defined this volume will generally be less than the entire mine so the defined volume must be segregated from the whole in the example of fig5 stop wall 54 has been placed in drift 32 one way to place such.