| Built By: | Denny (Leven) |
| Build Group: | E3 |
| Fate: | Scrapped in January 1921. |
| 01-03-1915 | Laid Down |
| 25-01-1917 | Launched |
| 13-03-1917 | Completed |
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| Length overall | 181 ft |
| Beam | 15 ft |
| Displacement | 667 tons (surface) |
| 807 tons (submerged) | |
| Diving Depth | 200 ft |
| Speed | Surface 15.25 knots (design) |
| Surface: 1500 miles on full power or 3000 miles at 10 knots (service) | |
| Submerged: 99 miles at 3 knots (design) | |
| Submerged: 10 miles at 9 knots or 65 miles at 5 knots (service) | |
| No. of shafts | 2 |
| Propeller | 3 blades, 5 ft 7 inch diameter |
| Armament | 2 x 18 inch bow tubes |
| 2 x 18 inch beam tubes | |
| 1 x 18 inch stern tube | |
| (10 torpedoes carried) | |
| 1 x 2-pounder gun | |
| Endurance | Surface: 3000 miles at 10 knots (design) |
| Surface: 1500 miles on full power or 3000 miles at 10 knots (service) | |
| Submerged: 99 miles at 3 knots (design) | |
| Submerged: 10 miles at 9 knots or 65 miles at 5 knots (service) | |
| Complement | 30 |
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| Class: | 1942 - 1946: X Class |
| Built By: | Vickers (Barrow) |
| Build Group: | X |
| Fate: | |
| Lost during an attack on on German Battleship Tirpitz in Altenfjord Norway on 22 Sept 1943 | |
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