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Step back in time at the Former Japanese Navy Underground Headquarters (Kaigungo) in Okinawa. This historical site offers a glimpse into Japan's wartime past, with a network of tunnels and rooms used by the Japanese ... Navy during World War II. Visitors can explore the underground complex, learn about the events that took place here, and gain insight into the island's role in the war. The site serves as a somber reminder of the sacrifices made during this tumultuous period in history. A visit to the Former Japanese Navy Underground Headquarters is a must for history buffs and those interested in learning about Japan's military history. Read more ▼