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Thousands of years after a catastrophic flood, the ancestors of the people living in Mt. Tulan live in an artificial environment known as Landring.

A high-ranking member of the people living on the coast, the Oceanics, has secretly built an underwater vessel and deployed it on a mission to the northern latitudes.

Sobuku Sato, a young scientist, and Kenshin Kamura, a seasoned submariner, embark on a journey to the north pole. Their mission: unlock an ancient secret that may determine the fate of the earth.