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
Ice Station Zebra (novel) under the North Pole), , and . MacLean may have been anticipating the excitement of his British readers regarding the upcoming commissioning of the , the Royal Navy's first nuclear submarine. Also, MacLean may have been influenced by press reports about the nuclear-powered submarine USS "Skate" visiting Ice Station "Alpha", located on Ice Island T-3 in the Arctic, on 14 August 1958, as part of the International Geophysical Year (IGY)". At the time that the novel was published, under-the-ice operations by US Navy nuclear-powered submarines were prohibited until SUBSAFE measures had been implemented following the loss of the . "Ice