Abstract: The invention includes a pressure vessel and a method of pressurizing, via a fluid medium, waste matter at an ultra high pressure. The invention includes an ultra high pressure vessel. The pressure vessel has quick opening closures at each end. A fluid medium is available for supply to pressure vessel cavity within the pressure vessel. A means for supplying the fluid medium under ultra high pressures into the fluid vessel cavity is also provided. The invention further includes a ram means or a means for loading and compacting the waste matter. The method includes pressurizing the matter at a sufficient pressure and holding the pressure for a sufficient time to sterilize the matter.