The present invention provides a system and method for the dissociation of water into H.sub.2 and O.sub.2 gas. The system and method disclose a reaction vessel having at least one radiolysis apparatus, at least one photolysis apparatus, and at least one electrolysis apparatus, all in communication with said reaction vessel. The reaction vessel has a body, a first end and a second end defining an interior. Further, the reaction vessel has an inlet for receiving water from a water supply into its interior and at least two outlet ports to allows H.sub.2 or O.sub.2 to egress therefrom. Still further, at least one catalyst is located within the interior of the reaction vessel. The radiolysis apparatus, photolysis apparatus, and electrolysis apparatus, in combination the with the catalyst provides for the dissociation of water into H.sub.2 and O.sub.2.