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Eternal Hell (無限地獄 Mugen Jigoku?) is the lowest level of Impel Down. It is where prisoners who are insanely powerful, have caused crimes extremely atrocious, and/or whose mere existences have become a major threat to the World Government itself are kept. The Fleet Admiral himself said even a single Level Six prisoner lurking in a remote country could be an incredible danger to the public. The prisoners on this level have been given either the death penalty or a life sentence. They are basically "erased" from history.
The prisoners on this floor are either jailed for the rest of their lives or until their execution day arrives. It simply seems to be a holding cell for life or until an execution and prisoners do not have to endure terrible conditions (burning heat, freezing cold, etc.) unlike the higher floors. The inhabitants of this level may simply be too powerful to be affected by torture. However, solitary imprisonment has been proven to be an effective torture in the real world, where even many prisoners wish for death out of sheer boredom.
