The USS H-1 (SS-28), originally designated USS Seawolf, was the lead vessel of her class of early 20th-century United States Navy submarines. Constructed by Union Iron Works in San Francisco, her keel was laid on 22 March 1911, and she was launched on 6 May 1913, sponsored by Miss Lesley Jean Makins. She was officially commissioned at Mare Island Navy Yard on 1 December 1913. Prior to her launching, she was renamed H-1 on 17 November 1911. Physically, H-1 measured 150 feet 4 inches (45.8 meters) in length, with a beam of 15 feet 10 inches (4.8 meters) and a mean draft of 12 feet 5 inches (3.8 meters). She displaced approximately 358 long tons (364 tonnes) on the surface and 467 long tons (474 tonnes) submerged. Her operational diving depth was 200 feet (61 meters). The crew consisted of 2 officers and 23 enlisted men. Powered by two 475-horsepower diesel engines for surface travel, she could reach speeds of 14 knots (26 km/h; 16 mph). When submerged, her propulsion shifted to four electric motors, providing a maximum submerged speed of 10.5 knots (19.4 km/h; 12.1 mph). She had a range of 2,300 nautical miles (4,300 km; 2,600 miles) at 11 knots on the surface and could operate submerged for about 100 nautical miles (190 km; 120 miles) at 5 knots. Her armament consisted of four 18-inch (450 mm) torpedo tubes located at the bow, with four reloads, totaling eight torpedoes. H-1 served primarily along the US West Coast with the 2nd Torpedo Flotilla, conducting exercises and patrols from San Pedro, California, often alongside sister ships H-2 and H-3. During World War I, she was based in New London, Connecticut, patrolling Long Island Sound and training officer students. Her service ended tragically in March 1920, when she ran aground off Magdalena Bay while transiting along the Baja California Peninsula. Four crew members, including her commanding officer, lost their lives during the grounding attempt. Efforts by the repair ship USS Vestal ultimately failed to save her, and she sank in approximately 50 feet of water. Her wreck was later identified south of Baja California in 2019. The vessel was stricken from the Naval Vessel Register in April 1920 and sold for scrap in June of that year.

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