general_dynamics_electric_boat | parentcompany | general_dynamics <tsp> american_submarine_nr-1 | builder | general_dynamics_electric_boat <tsp> general_dynamics_electric_boat | locationcity | groton,_connecticut <tsp> american_submarine_nr-1 | length | 450000 (millimetres) <sep> general dynamics electric boat (gdeb) is a subsidiary of general dynamics corporation it has been the primary builder of submarines for the united states navy for more than 100 years the company's main facilities are a shipyard in groton, connecticut, a hull-fabrication and outfitting facility in quonset point, rhode island, and a design and engineering facility in new london, connecticut 
general dynamics is the parent company of the general dynamics electric boat. which is located in groton. connecticut. and built the nr-1 submarine. which is 450000.0 mm millimetres long.company's main facilities are a shipyard in groton connecticut and a design and engineering facility in new london, connecticut