HMS G9, British World War I submarine in North Sea, GB.
The G-class submarine measured 187 feet in length with a beam of 22 feet and carried torpedo tubes for engaging enemy vessels.
Constructed at Vickers shipyard in Barrow-in-Furness, HMS G9 was commissioned in August 1916 and served during the final years of World War I.
The submarine represents British naval innovation during World War I, incorporating advanced design features including a partial double hull construction.
The vessel operated with a crew of 30 personnel and maintained surface speeds of 14 knots while patrolling the North Sea and German Bight.
HMS G9 sank in September 1917 during a tragic friendly-fire incident with HMS Pasley, leaving only one survivor, Stoker William Drake.
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