Ocean space utilization, the role of the ocean in global environmental changes such as global warming and extreme weather, and ocean resources such as renewable energy, offshore oil and methane hydrate have attracted attention. The marine environment fluctuates from time to time, and marine activities must withstand extreme marine environments such as typhoons and tsunamis. Experiments and observations are being conducted in the tank facilities to support development of elemental technologies necessary for marine environment measurement, marine space utilization, marine renewable energy development, and submarine resource development.