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| Year | Date | Historical Events | | 1911 | Nov 17 | Keel laid down by the Union Iron Works, San Francisco, CA. Seawolf was renamed H-1. | | 1913 | May 6 | Launched. | | | Dec 1 | Commissioned wuth LT. Henry M. Jensen in command.
| | 1917 | Oct 17 | Sailing from San Pedro, CA., H-1 reached New London 22 days later via Acapulco, Balboa, Key West, Charleston and Philadelphia. | | | Nov 8 | H-1 arrived at New London,CT. For the remainder of the war, she was based there and patrolled Long Island Sound, frequently with officer students from the submarine school on board.
| | 1920 | Feb 15 | H-1 and H-2 sailed for San Pedro, CA., Key West, FL. and Havana, Cuba. | | | Mar 12 | As H-1 made her way up the coast, the submarine went aground on a tricky shoal off Santa Margarita Island, CA. Four men, including the Commanding Officer, LCDR. James R. Webb, were killed as they tried to reach shore. | | | Mar 24 | Vestal, a repair ship, pulled H-1 off the rocks, only to have her sink 45 minutes later in some 50 feet of water. Salvage was abandoned. | | | Apr 12 | Struck from the Naval Register. Her hulk sold for salvage scrap in June 1920. |
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