Les Mystères du Nautilus (French for “The Mysteries of the Nautilus”) is a walkthrough attraction through the various chambers of Captain Nemo’s submarine the Nautilus. A similar walk-through existed in the 1950s in Disneyland California promoting the film release at that time. The Disneyland Paris version opened on July 4, 1994, about a year before Space Mountain: de la terre à la lune.
This attraction has often no waiting time which makes it perfect to avoid crowds and heat or cold.
Step on the carpet in front of the organ and you’ll see Captain Nemo’s face appearing in the mirror.