Impel Down Arc, One Piece Wiki

The Impel Down Arc, also referred to as the Great Prison Arc and Underwater Prison Arc, is the twenty-first story arc of the manga and anime One Piece, and the third story arc of the Summit War Saga. Luffy puts finding his crew on hold in favor of rescuing his brother Ace from the underwater prison Impel Down. With Boa Hancock's help, he manages to infiltrate the facility. However, fulfilling his objective and escaping the hellish prison might be easier said than done. Garp visits Ace at Impel D

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