Underworld of the Sea

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

Creatures encountered at this depth

 * Giant Poisonous Jellyfish
 * Carnivorous Tubeworms
 * Nogokoro Crab
 * Sea Devils
 * Umibozu