Since 1971- Disney's 20,000 Leagues Under the Sea quickly became one of the park's most popular attractions. Differing from the Disneyland submarines which were inspired by the United States' nuclear fleet of the 1950s, those at WDW were replicas of Captain Nemo's "Nautilus", the fanciful vessel depicted in the classic 1954 Disney film. The attraction closed in 1994 due to mechanicle problems and has never reopened since.Some small changes have taken place in the past few years ,a Disney character greeting spot and Ariel's Grotto along with King Trident's statue in the lagoon ,but with such an enormis space ,could another water attraction occupy this arena or could Fantasyland be expanded !