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 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.

They ate frozen TV dinners, bathed once a week with a bucket of water, and burned chlorate candles to produce oxygen.

"[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.