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List of episodes:
One Piece Special: Adventure in the Ocean's Navel

One Piece Special: Adventure in the Ocean's Navel

PG-13
SD
Special 49m
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)
AniWatch is the best site to watch One Piece Special: Adventure in the Ocean's Navel SUB online, or you can even watch One Piece Special: Adventure in the Ocean's Navel DUB in HD quality. You can also find A-1 Pictures anime on AniWatch website.