Final answer:
The USS Nautilus was the first nuclear submarine, deployed on January 17, 1955.
Step-by-step explanation:
The first nuclear sub put out to sea on January 17, 1955, was the USS Nautilus (A). It marked a significant advancement in naval technology and was a key component of the United States' nuclear capabilities during the Cold War era. The USS Nautilus represented a remarkable achievement, as it was the first vessel to complete a submerged transit to the North Pole and showed the potential of nuclear-powered submarines in the era of nuclear deterrence and strategic military positioning.