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
Captain Nemo the January Uprising; but Verne's editor Pierre-Jules Hetzel feared a book ban in the Russian market and offending a French ally, the Russian Empire, and had Verne obscure Nemo's motivation in the first book. In the second book of "Twenty Thousand Leagues under the Sea", Nemo comes close to revealing his Indian ancestry, though this is not obvious except in retrospect, where he saves a Ceylonese pearl-fisher in the Gulf of Mannar. "Twenty Thousand Leagues Under the Sea" was written between 1869 and 1870 and records the voyages of the "Nautilus" between 1866 and 1868. "The Mysterious Island" was written