World-wide anxiety about global warming due to the increasing concentration of CO₂ in the atmosphere has been accelerating studies on countermeasures, including the capture and sequestration of CO₂. The ocean sequestration of CO₂ is thought to be a promising option because of the huge amount of CO₂ to be treated, provided that the influence on the oceanic environment is acceptable. In this paper, the technical feasibility of the implementation of CO₂ injection into the ocean depths is studied. The conceptual outlines obtained here will be useful in the planning stage of coming research programs to model the behavior of CO₂ after injection.