20,000 Leagues Under the Sea: Submarine Voyage the cavern entrance simulating a surface storm, the Captain would order the submarine down into the depths as a precaution, and the guests enter the show building section of the attraction. Within minutes, the devastation such natural phenomenon can create was made clear with the ominous Graveyard Of Lost Ships, with shipwrecks from various centuries littering the sea bed, guarded by the silent, gliding figures of sharks. Leaving the destruction behind, the Nautilus would reach the North Pole, circumnavigating the Polar Ice Cap from below the surface, and narrowly avoiding large icebergs stabbing through the water. Venturing deeper, the Nautilus
Skipjack-class submarine planes were moved to the massive sail to cut down on flow-induced noise near the bow sonar arrays. They were known as sail planes or fairwater planes. The "Skipjack"s were the first class built with sail planes; they were later backfitted on the "Barbel"s. This design feature would be repeated on all U.S. nuclear submarines until the improved , the first of which was launched in 1988. The small "turtleback" behind the sail was the exhaust piping of the auxiliary diesel generator. The "Skipjack"s also introduced the S5W reactor to U.S. nuclear submarines. It was known as ASFR (Advanced Submarine