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SOMETHING FISHY ★


Yoji Ookato pulled on his dive gear. The underwater photographer gathered his waterproof cameras. Then he dove into the sea off southern Japan. When he reached the seafl oor, he saw something odd. It was a giant circle in the sand. The sand in the center looked smooth. A pattern of ridges was piled up around the edge of the circle. Other divers said they’d seen these mysterious circles, too. Yet no one had ever seen what made them.


A pufferfish swims back and forth as it makes a sand circle.


20 NATIONAL GEOGRAPHIC EXPLORER


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