Dark Waters (Once Upon a Time) is to take Snow's heart. The Land of Untold Stories is revealed to be the Mysterious Island from the book as the same name. The "Nautilus" is based on the submarine from "Twenty Thousand Leagues Under the Sea". Captain Nemo based on the protagonist from Jules Verne's novel "Twenty Thousand Leagues Under the Sea". Hook refers to the giant squid that attacks him as a kraken. The kraken is a legendary sea monster of giant size that is said to dwell off the coasts of Norway and Greenland. The episode posted its lowest numbers so far in the series, as
20,000 Leagues Under the Sea (Tokyo DisneySea) in a detour into an unknown world. The place where the guests end up was a world of Atlantis where mermen live. They had evolved their own in a place close to the center of the earth. The submarine was boosted by the mysterious power of the mermen, and was able to return to the base safely. This attraction's concept is similar to Disneyland's Submarine Voyage and Magic Kingdom's distinguished attraction . However, this ride does not go through real water; instead, several effect including bubbles in the window or the movements are added. 20,000 Leagues Under the Sea (Tokyo