Underworld of the Sea

The Underworld of the Sea (海の｢暗黒街」) is a deep sea area where light does not penetrate, where normal creatures are not allowed to exist.

History
The Straw Hat Pirates were carried by the Sea Currents to this place when Luffy knocked out the kraken that was blocking the way.

Franky stated that this area is approximately 7,000 meters below the surface.

Creatures Encountered at This Depth

 * Giant Poisonous Jellyfish
 * Carnivorous Tubeworms
 * Noppera-Crab
 * Anglerfish
 * Kraken
 * Blobfish

Trivia

 * All creatures that were encountered so far, are giant-versions of real-life animals that can be found in the deepsea.