| Built By: | Devonport Dockyard |
| Build Group: | K1 |
| Fate: | Scrapped in July 1926. |
| 08-11-1915 | Laid Down |
| 31-05-1916 | Launched |
| 01-02-1917 | Completed |
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| Length overall | 339 ft |
| Beam | 26 ft 6 inch |
| Draught | 20 ft 11 inch |
| Displacement | 1980 tons (surface) |
| 2566 tons (submerged) | |
| Diving Depth | 200 ft |
| Speed | Surface 24 knots (design) |
| Surface 24 knots (service) | |
| Submerged 10 to 10.5 knots (design) | |
| Submerged 9 knots (service) | |
| No. of shafts | 2 |
| Propeller | 3 blades, 7 ft 8 inch diameter |
| Armament | 4 x 18 inch bow tubes |
| 4 x 18 inch beam tubes | |
| (16 torpedoes carried) | |
| 2 x 4 inch guns | |
| 1 x 3 inch gun | |
| Endurance | Surface: 960 miles at full power (design) |
| Surface: 800 miles at full power or 12500 miles at 10 knots (service) | |
| Submerged: 13.5 miles at 9 knots (design) | |
| Submerged: 8 miles at 8 knots or 30 miles at 4 knots (service) | |
| Complement | 59 |
In the closing months of the war when US Navy and Royal Navy submarines no longer had a critical role to play in the final defeat of Japan
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