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Air Liquide is developing units for the production of oxygen and nitrogen in a marine environment based on gas separation technologies for aircraft-carriers or container ships used as military field hospitals.

Teams from Air Liquide support naval shipbuilders throughout the life cycle of their projects, from pilot feasibility study to on-site equipment start-up. They help shipbuilders select local service-providers to manufacture their systems. Cryogenic fluid testing facilities that are unique in Europe are also made available to them for qualification testing in a naval environment

Air Liquide is developing systems to store cryogenic oxygen for use in powering submarines in a dive and supplying their crews with breathable air.

As an historic supplier of decarbonation plants for French nuclear submarines (missile-launching nuclear submarine, nuclear attack submarine), the Air Liquide Group has developed a method for separating CO2 by adsorption on molecular sieves. Air Liquide Advanced Technologies has been responsible for this activity for some years. An innovative method for removing pollutants by cryotrapping, currently in the process of development, is already proving of interest to the military for nuclear submarine programmes of the future