CO2 CO2 gas can be converted into liquid at a certain high pressure. The liquid carbon dioxide is compressed into a cylindrical container (explosive cylinder) by a high-pressure pump, filled with a safety membrane, a bursting disc, a heat conducting rod and a sealing ring, and the alloy cap is tightened to complete the preparation work before blasting. Take the blasting barrel, blasting device and power cord to the blasting site, insert the blasting barrel into the drilling hole and fix it, and turn on the power supply of the blasting device. When the micro-current passes through the high thermal conductivity rod, it will produce high temperature to break through the safety membrane, vaporize liquid carbon dioxide instantly, and expand rapidly to produce high-pressure shock wave, which will automatically open the pressure relief valve and cause an explosion. Broken objects or deposits will be quickly pushed out by geometrically equivalent shock waves, and the whole process takes only 0.4 milliseconds from initiation to completion, and it will run at low temperature, and will not be mixed with liquids and gases in the surrounding environment, and will not produce any harmful gases, arcs and electric sparks, and will not be affected by high temperature, high heat and electric sparks. When the underground explosion is broken, the gas can be diluted without vibration and dust. Carbon dioxide is an inert gas, which is not flammable and explosive. The blasting process is a process of volume expansion, and physical work is not a chemical reaction.