The Former Japanese Navy Underground Headquarters is a significant historical site located in Tomigusuku on Okinawa Island, Japan. This former headquarters of the Imperial Japanese Navy now operates as a museum dedicated to the events of World War II and, specifically, the Battle of Okinawa.

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This underground complex consists of an extensive system of corridors and various rooms, with a total of about 300 meters open to the public. Inside, visitors can see the reconstructed conditions of the time: the commanding officer's office, officers' rooms, an operations room, a staff room, a medical office, and specialized areas such as a communications room, a code room, and a generator room.
The bunker is an important historical monument in Okinawa, serving as a reminder of past events and allowing visitors to connect with history. For a better understanding of the historical context and the events associated with this place, it is recommended to view the local museum's exhibits, which cover this period in detail, before entering the tunnels themselves.