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American submarine NR-1

Deep Submergence Vessel NR-1 was a unique United States Navy nuclear-powered ocean engineering and research submarine, built by the Electric Boat Division of General Dynamics at Groton, Connecticut. Wikipedia
Speed: : 4.5 knots (8.3 km/h; 5.2 mph) surfaced; 3.5 knots (6.5 km/h; 4.0 mph) submerged;
Launched: January 25, 1969
Length: 146′
Propulsion: 2 × external motors; 2 × propellers; 4 × ducted thrusters (mounted diagonally in two "x-configured" pairs)
Beam: 3.8 m (12 ft 6 in); 4.8 m (15 ft 9 in) at stern stabilizers
Complement: 3 officers, 8 crewmen, 2 scientists