공격 핵잠수함 55척(1) SSN 21 - USS Seawolf Keel Laid: October 25, 1989 Launched: June 24, 1995 Commissioned: July 19, 1997 Builder: General Dynamics Electric Boat Division, Groton, CT. Propulsion system: 1 S6W PWR (200 MW) Length, overall: 352 9" feet (107.6 meters) Beam: 40 feet (12.2 meters) Draft: 35 feet (10.67 meters) Displacement: 7460 tons (surfaced) 9137 tons (s..