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 publisher, Pierre-Jules Hetzel, who is known to be responsible for many serious changes in Verne's books. In the original text the mysterious captain was a Polish nobleman, avenging his family who were killed by the Russians in retaliation for the captain's taking part in the Polish January Uprising of 1863. As France was at the time allied with the Russian Empire, the target for Nemo's wrath was changed to France's old enemy, the British Empire, to avoid political trouble. Professor Pierre Aronnax does not suspect Nemo's origins, as these were explained only later, in Verne's next book. What remained in