1. THE METHOD OF MAKING A HIGH EXPLOSIVE WHICH IS LESS DENSE THAN WATER COMPRISING THE STEPS OF DISSOLVING AN EXPLOSIVE SELECTED FROM THE GROUP CONSISTING OF TRINITROTOLUENE, NITROCELLULOSE, PENTAERYTHRITOL AND CYCLO TRIMETHYLENETRINITRAMINE IN FROM ABOUT 5 TO ABOUT 80% BY WEIGHT OF A SOLVENT SELECTED FROM THE GROUP CONSISTING OF STYRENE, ACETONE, TOLUENE, BENZENE AND CYCLOHEXANONE, ADDING THERETO FROM ABOUT 5 TO ABOUT 30% BY VOLUME OF LIQUID POLYESTER RESIN TO FORM A MIXTURE, SAID RESIN CATALYZED TO GEL IN ABOUT FIFTEEN MINUTES AND TO SET PERMANENTLY IN ABOUT ONE HOUR, STIRRING SAID MIXTURE FOR ABOUT FIVE MINUTES FOR HOMOGENIZATION, ALLOWING SAID STIRRED MIXTURES TO REST FOR ABOUT FIVE MINUTES, INTRODUCING AIR UNDER PRESSURE FOR ABOUT THREE MINUTES IN RELATIVELY FINE STREAMS INTO THE MASS OF SAID MIXTURE TO CAUSE SAID MIXTURE TO EXPAND INTO A FOAM STRUCTURE AND POURING THE SAID FORMED MIXTURE INTO A MOLDING SPACE WHEREIN SAID FOAMED MIXTURE GELS AND SETS PERMANENTLY TO FORM AN EXPLOSIVE OF A HIGH DEGREE OF CELLULARITY.