This report covers efforts by the Hawaii Natural Energy Institute of the University of Hawaii under the ONR-funded HEET Initiative that addresses critical technology needs for exploration/utilization of seabed methane hydrates and development/testing of advanced fuel cells and fuel cell systems. Methane hydrates work included: hydrate thermochemistry and kinetics; environmental impacts of methane release from seafloor hydrates; hydrate engineering applications; and international collaborative R&D. In the fuel cell area, accomplishments ...