Changes

*Robert Fulton's 1800 ''Nautilus,'' the first submarine that actually worked;

*Robert Fulton's 1800 ''Nautilus,'' the first submarine that actually worked;

*Captain Nemo's fictional submarine in the 1870 Jules Verne novel ''Vingt Mille Lieues sous les Mers'' ("Twenty thousand Leagues Under the Sea")

*Captain Nemo's fictional submarine in the 1870 Jules Verne novel ''Vingt Mille Lieues sous les Mers'' ("Twenty thousand Leagues Under the Sea")

*The first nuclear submarine, the 1951 [[U. S. S. Nautilus]]

*The first nuclear submarine, the 1951 [[USS Nautilus]]