During the construction of Disneyland, Tomorrowland was the most under-developed area of the park, with much of the space dedicated to exhibits from corporate sponsors. To fill some extra space that hadn't signed on a sponsor, Disney chose to install an exhibit on the recent film 20,000 Leagues Under the Sea. This would tie into Tomorrowland for the themes of nuclear power Disney added to the story, as well as demonstrate some of the special effects technology that went into "the Mightiest Motion Picture of Them All".
Featuring a circular floor plan and narrated by Thurl Ravenscroft, the exhibit began with a model of the Golden Arrow, the ship of Professor Arronax and a viewport of the full-size Nautilus exterior setpiece in its final resting place, which the exhibit radiates around. The tour of the Nautilus sets begins with the Wheelhouse, Charthouse, and Professor Arronax's Cabin. The Salon is the largest room on the tour and is home to a viewport looking out to the mechanical Giant Squid prop from the film. The tour continues through the Pump Room, Diving and Fitting Chamber, and the Power Room, concluding on a larger viewpoint of the Nautilus's final resting place as well as the shooting model of the Nautilus with matte paintings for Vulcania.