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 the Sea"." "The Toilers of the Sea" also contains an episode where a worker fights a giant octopus, wherein the octopus symbolizes the Industrial Revolution. It is probable that Verne borrowed the symbol, but used it to allude to the Revolutions of 1848 as well, in that the first man to stand against the "monster" and the first to be defeated by it is a Frenchman. In several parts of the book, Captain Nemo is depicted as a champion of the world's underdogs and downtrodden. In one passage, Captain Nemo is mentioned as providing some help to Greeks rebelling against