Deep Submergence Vessel NR-1 was a unique United States Navy (USN) nuclear-powered ocean engineering and research submarine, built by the Electric Boat Division of General Dynamics at Groton, Connecticut.

NR-1's missions included search, object recovery, geological survey, oceanographic research, and installation and maintenance of underwater equipment.

NR-1 had the unique capability to remain at one site and completely map or search an area with a high degree of accuracy, and this was a valuable asset on several occasions.

One publicly acknowledged mission in 1976 was to recover parts of an F-14 that were lost from the deck of an aircraft carrier[5] and sank with at least one AIM-54A Phoenix air-to-air missile.

NR-1 remained submerged and on station even when heavy weather and rough seas hit the area and forced all other search and recovery ships into port.

[10] On 25 February 2007, NR-1 arrived in Galveston, Texas, towed by Carolyn Chouest, in preparation for an expedition to survey the Flower Garden Banks National Marine Sanctuary and other sites in the Gulf of Mexico.

"[7][12] NR-1 was generally towed to and from remote mission locations by an accompanying surface tender, which was also capable of conducting research in conjunction with the submarine.

NR-1's last mother ship was MV Carolyn Chouest, which provided towing, communications, berthing, and direct mission support for all NR-1 operations—a versatile platform and an indispensable member of the NR-1 deep submergence team.