stewardess - IMPER DOWN - ONE PIECE 3D print model

Impel Down, also known as the Underwater Prison (海底監獄, Kaitei Kangoku?) and the Great Prison (大監獄, Dai Kangoku?), is a government-controlled stronghold in Paradise together with Marine Headquarters and Enies Lobby. It is the World Government's maximum-security prison for the most dangerous criminals and pirates.[2] It is located underwater in the middle of the Calm Belt and part of the Tarai Current.[3]

Impel Down is the main setting of the Impel Down Arc, with the prison's staff acting as the main antagonist group in the same arc.