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One Piece: Adventure in the Ocean's Navel
One Piece: Umi no Heso no Daibouken-hen // ワンピース ルフィ落下!秘境・海のヘソの大冒険
The Straw Hats encounter a city in the middle of a whirlpool, called the Ocean's Navel, that is being destroyed by giant monsters. These monsters supposedly protect a treasure capable of granting wishes, but in the process of defeating these guardians, the crew ends up releasing another evil. (aired after Episode 53)
(Source: Wikipedia)