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Updated:May 23, 2023
Remains of the Imperial Japanese Navy Sasebo Naval Station Air Defense Command Post

Airplanes participated in actual fighting for the first time during World War I. The aeronautical technologies rapidly progressed and became a menace to war vessels and cities. Sasebo Naval Station conducted the first air-raid drill in 1924. In around 1935, the construction of anti-aircraft guns batteries got into full swing and a new Air Defense Command Post was built in the basement of the Sasebo Naval Station headquarters building in 1942. It was a two-story facility and its total floor space was 700 square meters. Its main roles were to integrate information from the outlooks around the naval port and to control the anti-aircraft warfare. During the Sasebo Air Raid in June 1945, the headquarters building was burned down, but the underground command post survived. After the Pacific War, the interior was burnt in a suspicious fire, but the underground shelter itself still remains due to its robustness.
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