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Terowongan Bawah Tanah Akayama
Ini adalah reruntuhan tempat penampungan udara yang belum selesai - tempat penampungan dengan panjang 1.6 km yang dikatakan telah dibuat oleh Korps Angkatan Laut Tateyama selama Perang Dunia II.
Selain reruntuhan pembangkit listrik di dalamnya, ada juga akun kantor, rumah sakit, ruang telegrap, dan lain-lain.