USS Dolphin (AGSS 555), homeported Naval Research Center and Development (NRaD) facility in San Diego, was the Navy's only operational, diesel-electric, deep-diving, research and development of submarines. She could carry scientific payloads of more than 12 tonnes, a capacity much greater than any other deep dive boat operating in research today. Dolphin may also keep the most extensive facilities onboard laboratory deep submersible counterparts.USS Dolphin Navy submarine was diving depth designed to test advanced submarine structures, sensors, weapons, communications systems and machines. USS DOLPHIN served as a scientific platform capable of operations at an unprecedented depth, far superior to any known operational submarine. In November 1968, set a depth record for operating submarines that still stands. In August 1969, launched a torpedo from the deepest anyone has been fired.
