USS K-7 (SS-38) was an K-class

United States K class submarine

The K class submarines were a class of eight submarines of the United States Navy, serving between 1914 and 1923.-Ships: -See also:...

 submarine

Submarine

A submarine is a watercraft capable of independent operation below the surface of the water. It differs from a submersible, which has more limited underwater capability...

, of the United States Navy

United States Navy

The United States Navy is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States. The U.S. Navy is the largest in the world; its battle fleet tonnage is greater than that of the next 13 largest navies combined. The U.S...

. Her keel was laid down by the Union Iron Works

Union Iron Works

Union Iron Works, located in San Francisco, California, on the southeast waterfront, was a central business within the large industrial zone of Potrero Point, for four decades at the end of the nineteenth and beginning of the twentieth centuries.-History:...

, on San Francisco, California

San Francisco, California

San Francisco , officially the City and County of San Francisco, is the financial, cultural, and transportation center of the San Francisco Bay Area, a region of 7.15 million people which includes San Jose and Oakland...

, under a subcontract from Electric Boat

Electric boat

While a significant majority of water vessels are powered by diesel engines, with sail power and gasoline engines also remaining popular, boats powered by electricity have been used for over 120 years. Electric boats were very popular from the 1880s until the 1920s, when the internal combustion...

 Company of Groton, Connecticut

Groton, Connecticut

Groton is a town located on the Thames River in New London County, Connecticut, United States. The population was 39,907 at the 2000 census....

. She was launched

Ship naming and launching

The ceremonies involved in naming and launching naval ships are based in traditions thousands of years old.-Methods of launch:There are three principal methods of conveying a new ship from building site to water, only two of which are called "launching." The oldest, most familiar, and most widely...

 on 20 June 1914 sponsored by Mrs. Katie-Bel McGregor, daughter of the President of Union Iron Works

Union Iron Works

Union Iron Works, located in San Francisco, California, on the southeast waterfront, was a central business within the large industrial zone of Potrero Point, for four decades at the end of the nineteenth and beginning of the twentieth centuries.-History:...

, and commissioned

Ship commissioning

Ship commissioning is the act or ceremony of placing a ship in active service, and may be regarded as a particular application of the general concepts and practices of project commissioning. The term is most commonly applied to the placing of a warship in active duty with its country's military...

 at Mare Island

Mare Island

Mare Island is a peninsula in the United States alongside the city of Vallejo, California, about northeast of San Francisco. The Napa River forms its eastern side as it enters the Carquinez Strait juncture with the east side of San Pablo Bay. Mare Island is considered a peninsula because no full...

 on 1 December with Lieutenant

Lieutenant

A lieutenant is a junior commissioned officer in many nations' armed forces. Typically, the rank of lieutenant in naval usage, while still a junior officer rank, is senior to the army rank...

 J. V. Ogan in command.

Service history

As a unit of the Pacific Torpedo Flotilla, K-7 sailed for San Diego, California

San Diego, California

San Diego is the eighth-largest city in the United States and second-largest city in California. The city is located on the coast of the Pacific Ocean in Southern California, immediately adjacent to the Mexican border. The birthplace of California, San Diego is known for its mild year-round...

, on 26 December, arriving 28 December to commence shakedown and training along the California

California

California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...

 coast. She returned to San Francisco 4 June 1915, then departed 3 October for experimental duty in the Hawaiian Islands

Hawaiian Islands

The Hawaiian Islands are an archipelago of eight major islands, several atolls, numerous smaller islets, and undersea seamounts in the North Pacific Ocean, extending some 1,500 miles from the island of Hawaii in the south to northernmost Kure Atoll...

. Arriving Pearl Harbor

Pearl Harbor

Pearl Harbor, known to Hawaiians as Puuloa, is a lagoon harbor on the island of Oahu, Hawaii, west of Honolulu. Much of the harbor and surrounding lands is a United States Navy deep-water naval base. It is also the headquarters of the U.S. Pacific Fleet...

 on 14 October, she conducted torpedo

Torpedo

The modern torpedo is a self-propelled missile weapon with an explosive warhead, launched above or below the water surface, propelled underwater towards a target, and designed to detonate either on contact with it or in proximity to it.The term torpedo was originally employed for...

 and diving tests and participated in operations developing the tactics of submarine warfare. K-7 departed Pearl Harbor 31 October 1917, and sailed via the West Coast and the Panama Canal

Panama Canal

The Panama Canal is a ship canal in Panama that joins the Atlantic Ocean and the Pacific Ocean and is a key conduit for international maritime trade. Built from 1904 to 1914, the canal has seen annual traffic rise from about 1,000 ships early on to 14,702 vessels measuring a total of 309.6...

 for antisubmarine patrol duty in the Gulf of Mexico

Gulf of Mexico

The Gulf of Mexico is a partially landlocked ocean basin largely surrounded by the North American continent and the island of Cuba. It is bounded on the northeast, north and northwest by the Gulf Coast of the United States, on the southwest and south by Mexico, and on the southeast by Cuba. In...

.

Arriving Key West, Florida

Key West, Florida

Key West is a city in Monroe County, Florida, United States. The city encompasses the island of Key West, the part of Stock Island north of U.S. 1 , Sigsbee Park , Fleming Key , and Sunset Key...

, on 8 January 1918, K-7 patrolled the shipping lanes of the Gulf of Mexico from the Florida Keys

Florida Keys

The Florida Keys are a coral archipelago in southeast United States. They begin at the southeastern tip of the Florida peninsula, about south of Miami, and extend in a gentle arc south-southwest and then westward to Key West, the westernmost of the inhabited islands, and on to the uninhabited Dry...

 to Galveston Bay

Galveston Bay

Galveston Bay is a large estuary located along the upper coast of Texas in the United States. It is connected to the Gulf of Mexico and is surrounded by sub-tropic marshes and prairies on the mainland. The water in the Bay is a complex mixture of sea water and fresh water which supports a wide...

. She returned to Key West from Galveston, Texas

Galveston, Texas

Galveston is a coastal city located on Galveston Island in the U.S. state of Texas. , the city had a total population of 47,743 within an area of...

, on 27 November and resumed training and development operations until departing for Philadelphia Navy Yard on 14 April 1919. She received an overhaul from 21 April to 10 November, then resumed operations out of Key West in the Caribbean Sea

Caribbean Sea

The Caribbean Sea is a sea of the Atlantic Ocean located in the tropics of the Western hemisphere. It is bounded by Mexico and Central America to the west and southwest, to the north by the Greater Antilles, and to the east by the Lesser Antilles....

. Following additional overhaul during the latter half of 1921, K-7 resumed her training and development operations at the United States Naval Academy

United States Naval Academy

The United States Naval Academy is a four-year coeducational federal service academy located in Annapolis, Maryland, United States...

 on 19 January 1921.

For more than two years, she ranged the eastern seaboard from Hampton Roads

Hampton Roads

Hampton Roads is the name for both a body of water and the Norfolk–Virginia Beach metropolitan area which surrounds it in southeastern Virginia, United States...

, Virginia

Virginia

The Commonwealth of Virginia , is a U.S. state on the Atlantic Coast of the Southern United States. Virginia is nicknamed the "Old Dominion" and sometimes the "Mother of Presidents" after the eight U.S. presidents born there...

, to Provincetown, Massachusetts

Provincetown, Massachusetts

Provincetown is a New England town located at the extreme tip of Cape Cod in Barnstable County, Massachusetts, United States. The population was 3,431 at the 2000 census, with an estimated 2007 population of 3,174...

, training submariners, conducting diving experiments, and practicing underwater warfare tactics. During April and May 1921, she visited the Naval Academy at Annapolis, Maryland

Annapolis, Maryland

Annapolis is the capital of the U.S. state of Maryland, as well as the county seat of Anne Arundel County. It had a population of 38,394 at the 2010 census and is situated on the Chesapeake Bay at the mouth of the Severn River, south of Baltimore and about east of Washington, D.C. Annapolis is...

, and the United States Military Academy

United States Military Academy

The United States Military Academy at West Point is a four-year coeducational federal service academy located at West Point, New York. The academy sits on scenic high ground overlooking the Hudson River, north of New York City...

 at West Point, New York

West Point, New York

West Point is a federal military reservation established by President of the United States Thomas Jefferson in 1802. It is a census-designated place located in Town of Highlands in Orange County, New York, United States. The population was 7,138 at the 2000 census...

. After conducting almost seven months of submarine instructions at New London, Connecticut

New London, Connecticut

New London is a seaport city and a port of entry on the northeast coast of the United States.It is located at the mouth of the Thames River in New London County, southeastern Connecticut....

, she arrived Hampton Roads, 7 September 1922, for submarine flotilla operations in Chesapeake Bay

Chesapeake Bay

The Chesapeake Bay is the largest estuary in the United States. It lies off the Atlantic Ocean, surrounded by Maryland and Virginia. The Chesapeake Bay's drainage basin covers in the District of Columbia and parts of six states: New York, Pennsylvania, Delaware, Maryland, Virginia, and West...

. Subsequently, K-7 decommissioned at Hampton Roads 12 February 1923. She was towed to Philadelphia 23 August 1924; struck from the Naval Vessel Register

Naval Vessel Register

The Naval Vessel Register is the official inventory of ships and service craft in custody of or titled by the United States Navy. It contains information on ships and service craft that make up the official inventory of the Navy from the time a vessel is authorized through its life cycle and...

on 18 December 1930; and sold for scrap 3 June 1931.