In Japan, efforts toward offshore wind power generation in the Exclusive Economic Zone (EEZ) are becoming increasingly active under the goal of achieving net zero greenhouse gas emissions by 2050. Since offshore wind power platforms are located far from shore, making access difficult, reducing the overall cost of maintenance operations is considered essential. Furthermore, the transfer of maintenance personnel via CTV (Crew Transfer Vessel) is influenced by sea conditions, making the unmanned operation of the maintenance system desirable. Therefore, the use of USVs (Unmanned Surface Vehicles) and UUVs (Unmanned Underwater Vehicles) is expected to become necessary. However, the operation of USVs and UUVs involves numerous engineering challenges, such as ensuring watertightness, utilizing ultrasonic devices, and maintaining position control in harsh marine environments. These functions must be developed through repeated trial and error in real sea conditions. In this paper, we report on the construction of a prototype platform designed for the development of a USV/UUV hybrid system aimed at the maintenance of marine structures, serving as a basis for the development of various functions.
