USS Nautilus (SSN-571) Nuclear Landmark. Visitors may tour the forward two compartments, with guidance from an automated system. Despite similar alterations to exhibit the engineering spaces, tours aft of the control room are not permitted due to safety and security concerns. USS Nautilus (SSN-571) USS "Nautilus" (SSN-571) was the world's first operational nuclear-powered submarine and the first submarine to complete a submerged transit of the North Pole on 3 August 1958. Sharing names with Captain Nemo's fictional submarine in Jules Verne's classic 1870 science fiction novel "Twenty Thousand Leagues Under the Sea", and named after another that served with distinction in World War
Sphere (novel) original code, Johnson realizes by transposition the entity's name should be "Harry" (Adams). Johnson hypothesizes that the sphere is an object which allows a person's subconscious thoughts to manifest in reality, and Harry Adams has acquired the power through entering it. (Confirmed by his childhood fear of squid, especially the giant squid in the novel "Twenty Thousand Leagues Under the Sea", manifested in the form of a vast number of small squid and later a giant squid that attacks the DH-8 Habitat.) Johnson and Halpern sedate Adams and wait for contact to be re-established with the surface, but the manifestations