| Built By: | Scotts (Clyde) |
| Build Group: | S1 |
| Fate: | To Italy 25th October 1915 |
| 04-03-1914 | Laid Down |
| 10-06-1915 | Launched |
| 25-09-1915 | Completed |
| 25-10-1915 | Transferred to Italy |
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| Length overall | 217 ft |
| Beam | 23 ft 6 inch |
| Depth | 11 ft |
| Displacement | 872 tons (surface) |
| 990 tons (submerged) | |
| Diving Depth | 350 ft |
| Speed | Surface 15 knots (design) |
| Surface 14.75 knots (service) | |
| Submerged 10 knots (design) | |
| Submerged 9 knots (service) | |
| No. of shafts | 2 |
| Endurance | Surface: 6000 miles at 10 knots (design) |
| Armament (i) | 6 x 21 inch bow tubes |
| 1 21 inch stern tube | |
| (13 torpedoes carried) | |
| 1 x 3 inch gun | |
| 3 x 0.303 inch machine-guns | |
| 1 x 20mm Oerlikon cannon | |
| Complement | 4 Officers and 34 Ratings. |
| Note | {i) The armament of submarines of this class varied considerably. For example: 23 boats were fitted with the six bow tubes only; 18 vessels, intended to operate in the Far East, had their 3 inch guns replaced by 4 inch guns; whilst, in some boats, the Oerlikon cannon replaced, rather than supplemented, the three machine-guns. |
| Class: | 1916 - 1945: L Class |
| Built By: | Vickers (Barrow) |
| Build Group: | L1 |
| Fate: | |
| Scrapped in 1930 after breaking away from her tug and drifting ashore in heavy weather. | |
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