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April 25:The Gallipoli Landings, ANZAC Day111yr ago
USS Nautilus SSN-571 first nuclear-powered submarine at sea

#11: USS Nautilus (SSN-571): The Submarine That Conquered the North Pole

On January 17, 1955, USS Nautilus transmitted the historic message: "Underway on nuclear power." She was the world's first nuclear-powered vessel of any kind, and she immediately shattered every submarine record in existence. In her first two years, she traveled more miles submerged than the entire U.S. submarine fleet had managed in all of World War II combined.

On August 3, 1958, Nautilus completed the first submerged transit of the North Pole, traveling beneath the Arctic ice cap from the Pacific to the Atlantic in Operation Sunshine. The voyage proved that nuclear submarines could operate anywhere in the world's oceans, regardless of ice cover, a revelation that transformed Cold War naval strategy overnight. Nautilus's nuclear reactor meant she never needed to surface for air (diesel boats had to surface regularly to recharge batteries), could maintain high speeds indefinitely, and could stay submerged for months. She represented the most important leap in military technology in submarine history and is now preserved as a museum ship in Groton, Connecticut.