| gptkbp:instanceOf | gptkb:marine 
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                                | gptkbp:armament | gptkb:Mk_48_torpedoes gptkb:Tomahawk_cruise_missiles
 8 × 660 mm torpedo tubes
 
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                                | gptkbp:beam | 40 feet 
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                                | gptkbp:builder | gptkb:General_Dynamics_Electric_Boat 
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                                | gptkbp:builtYear | gptkb:Groton,_Connecticut 
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                                | gptkbp:commissioned | 19 July 1997 
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                                | gptkbp:cost | approximately $3 billion 
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                                | gptkbp:countryOfOrigin | gptkb:United_States 
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                                | gptkbp:crewComplement | 140 (officers and enlisted) 
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                                | gptkbp:displacement | 9,138 tons (submerged) 
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                                | gptkbp:followedBy | gptkb:USS_Connecticut_(SSN-22) 
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                                | gptkbp:homeport | gptkb:Naval_Base_Kitsap,_Bangor,_Washington 
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                                | gptkbp:hullNumber | gptkb:SSN-21 
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                                | gptkbp:laidDown | 25 October 1989 
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                                | gptkbp:launched | 24 September 1994 
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                                | gptkbp:length | 353 feet 
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                                | gptkbp:namedAfter | seawolf (fish) 
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                                | gptkbp:nickname | gptkb:Seawolf 
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                                | gptkbp:notableFor | advanced quieting features first of its class
 high speed and deep diving capability
 
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                                | gptkbp:operator | gptkb:United_States_Navy 
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                                | gptkbp:partOf | gptkb:marine 
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                                | gptkbp:precededBy | gptkb:marine 
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                                | gptkbp:propulsion | gptkb:S6W_nuclear_reactor 
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                                | gptkbp:speed | over 35 knots (submerged) 
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                                | gptkbp:sponsor | gptkb:Margaret_Dalton 
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                                | gptkbp:status | in active service 
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                                | gptkbp:bfsParent | gptkb:United_States_Submarine_Force 
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                                | gptkbp:bfsLayer | 4 
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                                | https://www.w3.org/2000/01/rdf-schema#label | USS Seawolf (SSN-21) 
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