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 title; the French title actually means "Twenty Thousand Leagues Under the Seas"). In the Argyle Press/Hurst and Company 1892 Arlington Edition, the translation and editing mistakes attributed to Mercier are missing. Scaphandre is correctly translated as "diving apparatus" and not as "cork-jackets". Although the book cover gives the title as "Twenty Thousand Leagues Under the Sea", the title page titles the book "Twenty Thousand Leagues Under the Seas; Or, The Marvelous and Exciting Adventures of Pierre Arronax, Conseil His Servant, and Ned Land a Canadian Harpooner". A modern translation was produced in 1966 by Walter James Miller and published by