A system for the manufacture, storage and transportation of hydrogen and oxygen gas wherein deep sealed production chambers (10) capable of withstanding high pressures are provided and water is fed by gravity from a water source to the bottom of the deep sealed production chamber (10) thereby producing water(16) in the bottom of the production chamber (10) under substantial pressure. Hydrogen and oxygen gas are produced in the water at the bottom of the production chamber (10) with electrolysis and the produced oxygen is captured in an oxygen escape pipe (18) extending from the bottom of the production chamber (10) to the exterior (19) of the production chamber (10), the oxygen escape pipe (18) containing a positive anode electrode (25) for the electrolysis in the bottom end of the oxygen pipe. The hydrogen gas is collected under pressure at the upper storage area (22) of the production chamber (10).
