In the winter of 1987, Kihachiro Aratake, a local tourism group director, was diving off the southern coast of Yonaguni island, in Japan, searching for a good place to observe hammerhead sharks.

1987年冬天，当地旅游集团负责人Kihachiro Aratake在日本与那国岛南部海岸潜水，寻找观察双髻鲨的好地方。