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4 Watch the second half of the video and complete Kihachiro Aratake's story.

This is Kihachiro Aratake - he's a 1¹.... . He was diving near the 2.... of Yonaguni when he found something amazing. It looked like a small 3.... under the water. It had 4...., steps and tall towers. One stone had strange marks - was it ancient writing? Some 5.... think this structure is over 10,000 years old. They say it was once above the water.

Help!!!​