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 (1954 film) film's script without the usage of any of the film's cast for character voices. In addition, both albums were narrated by Ned Land as opposed to Aronnax, who narrated the film and the original novel. Neither album mentioned Nemo as actually being "cracked" (i.e. insane), as the film does, and considerably sanitized the character by omitting any mention of him killing anyone and even having him sing sea chanties with his crew. The albums also had Nemo surviving at the end and releasing Ned, Arronax, and Conseil out of gratitude for their saving his life. In this version, Ned, Aronnax