The Hario Transmitting Station is located on Hario Island in the southern part of the city of Sasebo. It was a long-wave radio communication facility built by the Navy. The Russo-Japanese War necessitated a strengthening of Japan’s radio communications. This station was completed in 1922 after four years of construction at a total cost of ¥1.55 million yen (approximately ¥25 billion yen today). This is said to be the place where the coded message, “”Climb Mount Nii-taka 1208,” was transmitted, which started the Pacific War. Designed by the Sasebo Naval District’s Building Division, the station consists of three radio towers and a transmission room that acts as the telecommunications office. Hario Transmitting Station is the only existing long-wave radio communication facility in Japan. It is a cultural property of great historical value related to the history of civil engineering, as it demonstrates the advanced concrete technologies in use in Japan in the early 1900s.