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) who had first seen him on-screen in the film identify him most strongly with this role. "20,000 Leagues Under the Sea" received positive reviews from critics, was the second highest-grossing film of the year (behind "White Christmas"), earning $8 million in box office attendance in North America and has become a notable classic film of the Disney corporation. Modern-day film critic Steve Biodrowski said that the film is "far superior to the majority of genre efforts from the period (or any period, for that matter), with production design and technical effects that have dated hardly at all." Biodrowski also added