Although produced by different studios, it is obvious that the exterior design of the "Nautilus" submarine as seen in the film was heavily influenced by
Harper Goff's "half crocodile/half shark" Nautilus design in Disney's
20000 Leagues Under the Sea (1954), especially with respect to the sub's top spar and rounded "eye" windows. In the original
Jules Verne novels of "20,000 Leagues Under the Sea" and "Mysterious Island", the Nautilus is described as being rather plain, basically a cigar-shaped steel tube with very little outside detailing.
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