In 1958, in utter secrecy, the world's first nuclear submarine, USS Nautilus, voyaged beneath the ice of the North Pole and entered into legend. "Nautilus 90 degrees North", flashed the telegram, informing the world of the boat's historic undersea crossing. A message that would sink home both in Washington and Moscow, hinting of American technical prowess and the tilting of the strategic power. That voyage was captured on disc and long forgotten. Charles Wheeler , speaking with the captain and crew of the Nautilus, reveals a hidden history of adventure and political intrigue at the limits of human knowledge. Producer Mark Burman