USS Seawolf (SSN-21)

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USS Seawolf (SSN-21) is a nuclear-powered fast-attack submarine and the lead ship of the Seawolf class in the U.S. Navy. It is the fourth submarine named after the seawolf.

Construction and status
- Contract awarded: January 9, 1989
- Keel laid: October 25, 1989
- Launched: June 24, 1995
- Commissioned: July 19, 1997
- Time from keel to commissioning: 7 years 9 months (the longest for a U.S. Navy submarine)
- Home port: originally Groton, Connecticut; moved to Naval Base Kitsap-Bangor, Washington on July 22, 2007
- Motto: Cave Lupum (Beware the Wolf)
- Status: in active service
- Approximately 140 personnel assigned or attached

What she is and what she can do
- Class and type: Seawolf-class submarine
- Length: 353 feet (108 m); beam: 40 feet (12 m); draft: 36 feet (11 m)
- Propulsion: 1 S6W reactor producing about 220 MW (300,000 hp), two steam turbines (57,000 shp), one shaft with a pump-jet; complemented by a secondary submerged motor
- Speed: over 25 knots submerged; 18+ knots surfaced
- Test depth: greater than 800 feet (240 m)
- Crew: 15 officers and 101 enlisted
- Armament: eight 26.5-inch torpedo tubes sleeved for 21-inch weapons; room to carry up to 50 Tomahawk land-attack missiles, Harpoon anti-ship missiles, or Mk 48 torpedoes in the torpedo room

Notable history and operations
- Seawolf is the lead submarine of her class and the fourth U.S. Navy vessel named for the seawolf
- Was featured in a 1998 episode of Super Structures of the World: Seawolf, which covered its construction and sea trials
- 2015: deployed to the Arctic region for six months
- July 2020: deployed to the Arctic as part of the first U.S. Navy deployment during the COVID-19 pandemic; visited ports including HMNB Clyde in Faslane, Scotland, Gibraltar, and Tromsø, Norway