The USS G-1 (SS-19½/20), originally known as USS Seal, was the lead vessel of her class of early 20th-century United States Navy submarines. Laid down on February 2, 1909, by Newport News Shipbuilding & Drydock Company under a subcontract from Lake Torpedo Boat Company, she was launched on February 8, 1911, and renamed G-1 in November of that year. She was commissioned on October 28, 1912, at the New York Navy Yard. Constructed with a length suitable for early submarine designs, G-1 featured a distinctive armament configuration for her time, including a pair of fixed torpedo tubes in the bow and two additional torpedo tubes mounted inside her superstructure capable of being trained like deck guns while submerged, enabling broadside torpedo attacks. Her construction demanded exceptional performance standards; Lake Torpedo Boat Company did not receive payment during her build, reflecting the rigorous requirements she was designed to meet. Her service began with training and experimental operations. After fitting out in New York, G-1 conducted dive training and torpedo firing exercises in Long Island Sound and Narragansett Bay, achieving a record dive of 256 feet in 1913. Due to financial constraints, she was placed in reserve in June 1914 but was fully commissioned again in February 1915. Her early operational history involved maneuvers along the East Coast, including Norfolk and Charleston, where she encountered heavy seas and technical issues. By 1915, G-1 transitioned to a training ship at Newport, serving as an instructional platform for submarine personnel and testing submarine nets and detection devices during World War I. Her role expanded to experimental and development work, including sound detection and communications, aiding in anti-submarine warfare efforts off the U.S. coast. After the war, G-1 continued training activities until her decommissioning in March 1920. She was designated SS-20 in 1920 and used as a target ship for depth charge experiments. On June 21, 1921, while undergoing testing, she was damaged by depth charges and sank in 90 feet of water near Narragansett Bay. Attempts to salvage her failed, and she was officially struck from the Naval Vessel Register on August 29, 1921. Her operational history underscores early submarine development and experimentation during a formative period of naval warfare.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.