This tunnel complex was dug in 1944 for the navy headquarters in a hill overlooking the airport and the sea. It was 20m deep and stretched 450m in a semi-circular shape that could accommodate 4000 soldiers.
Conditions were dire with little water and food, high humidity during the rainy season, and plenty of fleas and lice. The Battle of Okinawa was very bloody with over 200,000 dead. Many Japanese troops and civilians decided to kill themselves rather than be captured by the Americans.
The tourism board opened the site in 1970, which is now a museum about its history.
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