Final answer:
The first nuclear-powered, deep-submergence research and ocean-engineering vehicle was launched in 1965.
Step-by-step explanation:
The first nuclear-powered, deep-submergence research and ocean-engineering vehicle was launched in 1965. It was called the USS Halibut (SSGN-587). The USS Halibut was a converted submarine that was used for various underwater missions, including the recovery of a Soviet Union missile from the ocean floor during the Cold War.