Mysterious Yonaguni Island structure

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The structure that show in above picture was sunk Yonaguni Island in Japan. This amazing structure was sunk 75feet bellow sea level and this can clearly identify as man made structure. This structure has the width of 600 feet and 90 feet tall. Normally this amazing structure belongs to 8000 years old civilization. This is a still mystery on what purpose these were made and how this sunk in to sea.