The CO2 system is a crucial safeguard for machinery spaces and cargo holds. It works by releasing a high concentration of carbon dioxide to displace oxygen and extinguish the fire. Strict safety procedures are vital: the space must be evacuated and sealed before discharge. Regular inspection of CO2 cylinders, their weighing or level checks, piping, and alarm systems is mandatory. Crew must be thoroughly trained in its operation, including the critical delay before release and understanding the associated life safety hazards, ensuring it functions as a lifesaving tool, not a risk.