Check availability of hydraulicoilmetamorphism, pollution, highlyliquidfuel tankis not whether the lower limit markers, the high-pressurepiping, jointshaveleakage.
Either way, the CO2 must be put somewhere, for which strategies include pumping it into rocky formations (such as depleted oil and gas wells) at a pressure of 100 atmospheres, or even piping it in liquid form under pressure onto the sea-floor where it is cold enough and the pressure high enough that it is hoped the material will stay there, assisted by the formation of CO2-hydrate.