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
Twenty Thousand Leagues Under the Sea outlawry is decisively ended by the combination of an international task force and the rebellion of his French captives. Though also widely published and translated, it never attained the lasting popularity of "Twenty Thousand Leagues". More similar to the original Nemo, though with a less finely worked-out character, is Robur in "Robur the Conqueror"—a dark and flamboyant outlaw rebel using an aircraft instead of a submarine—and its sequel "Master of the World". The novel was first translated into English in 1873 by Reverend Lewis Page Mercier. Mercier cut nearly a quarter of Verne's original text and made hundreds of translation