USS S-21

USS S-21 (SS-126) was a first-group S-class submarine of the United States Navy in commission from 1921 to 1922 and from 1923 to 1942. In 1928, she made the first gravimetric measurements ever made aboard a U.S. ship at sea. Prior to World War II, she operated in the Atlantic Ocean, Caribbean Sea, and Pacific Ocean, and after the United States entered the war, she operated off Panama. She then served in the Royal Navy as HMS P.553 from 1942 to 1944.

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submarine, S-class submarine, United States Navy, Royal Navy, Bethlehem Shipbuilding Corporation, 

• Dreadnought Project page^@
• uboat.net page^@
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Location: 43.6147, -69.9903, KML, Cluster Map, Maps,
3 places

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  USS Eagle Boat 56 ⓘ
  1919 Eagle-class patrol craft

• 

  USS S-21 ⓘ
  1920 S-class submarine

1939-09-01T00:00:00Z

1939-09-01T00:00:00Z

World War II Q362

1923-09-14T00:00:00Z

1923-09-14T00:00:00Z

ship recommissioning

1918-12-19T00:00:00Z

1918-12-19T00:00:00Z

keel laying

1920-08-18T00:00:00Z

1920-08-18T00:00:00Z

ship launching

1921-08-24T00:00:00Z

1921-08-24T00:00:00Z

ship commissioning

1923-09-14T00:00:00Z

1923-09-14T00:00:00Z

ship commissioning

1922-03-31T00:00:00Z

1922-03-31T00:00:00Z

ship decommissioning

1942-09-14T00:00:00Z

1942-09-14T00:00:00Z

ship decommissioning

1690-01-01T00:00:00Z

1690-01-01T00:00:00Z

1690 Battle of Fort Loyal

1703-08-10T00:00:00Z

1703-08-19T00:00:00Z

1703 Battle of Falmouth

1863-06-27T00:00:00Z

1863-06-27T00:00:00Z

1863 Battle of Portland Harbor

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Frameless

SS-126, USS S-21, Outboard Profile - NARA - 70646206

SS-126, USS S-21, Sections - NARA - 70646212

SS-126, USS S-21, Inboard Profile - NARA - 70646208

SS-126, USS S-21, Battery Deck - NARA - 70646210

SS-126, USS S-21, Cover Sheet - NARA - 70646204

USS S-21 SS-126 palms

Type	Subtype	Date	Description	Notes	Source
event	armed conflict	1690	Battle of Fort Loyal	battle	Wikidata
event	armed conflict	1703	Battle of Falmouth	battle	Wikidata
event	armed conflict	1863	Battle of Portland Harbor	battle	Wikidata
link	page		Dreadnought Project page@		Wikidata
link	page		uboat.net page@		Wikidata
object	watercraft		USS Eagle Boat 56	patrol vessel, Eagle-class patrol craft	Wikidata
object	watercraft		USS S-21	S-class submarine, submarine	Wikidata
organisation	shipbuilding company	1943	New England Shipbuilding Corporation	shipbuilding, shipbuilding company	Wikidata
site	artillery battery	1942	Battery Steele	artillery battery	Wikidata
site	fort		Fort McKinley	artillery fort	Wikidata
site	fort		Fort Scammel	artillery fort, human settlement	Wikidata
site	fort		Harbor Defenses of Portland	fort	Wikidata
site	fort	1678	Fort Loyal	fort, Kingdom of Great Britain	Wikidata
site	fort	1794	Fort Sumner	fort	Wikidata
site	fort	1808	Fort Preble	fort	Wikidata
site	fort	1857	Fort Popham	memorial, fort	Wikidata
site	fort	1865	Fort Gorges	fort	Wikidata
site	fort	1898	Fort Levett	fort	Wikidata
site	fort	1898	Fort Williams	fort	Wikidata
site	fort	1905	Fort Baldwin	fort	Wikidata
commons	image		SS-126, USS S-21, Outboard Profile - NARA - 70646206		Commons
commons	image		SS-126, USS S-21, Sections - NARA - 70646212		Commons
commons	image		SS-126, USS S-21, Inboard Profile - NARA - 70646208		Commons
commons	image		SS-126, USS S-21, Battery Deck - NARA - 70646210		Commons
commons	image		SS-126, USS S-21, Cover Sheet - NARA - 70646204		Commons
commons	image		USS S-21 SS-126 palms		Commons