This article forecasts about underwater utility base for coastal construction and inspection by AUV, ROV, and several machineries. Coastal engineering and construction for port and airport at the sea space will be transformed to the "Robotics Construction" because of lack of labors and skilled workers. It is important that the base provides information for real time positioning underwater as the GNSS satellite as a bench mark. Because the automated machines and robots can recognize their situation of the site only by the measured information, the base must sense hydrographic data and send it as the condition of the works. Additionally, the base should monitor the environment data during both of the construction and after operation. The bases will consist network system for coastal engineering and hazard attentions. Those underwater base and station will change the future coastal engineering as the infrastructure of the maritime state.