| Built By: | Beardmore (Clyde) |
| Build Group: | L1 |
| Fate: | Scrapped 1935 |
| 19-10-1916 | Laid Down |
| 14-01-1918 | Launched |
| 10-07-1918 | Completed |
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| Length overall | 231 ft 1 inch |
| Beam | 23 ft 6 inch |
| Draught | 13 ft 3 inch |
| Displacement | 891 tons (surface) |
| 1074 tons (submerged) | |
| Diving Depth | 150 ft |
| Speed | Surface 17 knots (design) |
| Surface 17 to 17.5 knots (service) | |
| Submerged 10.5 knots (design) | |
| Submerged 10.5+ knots (service) | |
| No. of shafts | 2 |
| Propeller | 3 blades, 5 ft 7 inch diameter |
| Endurance | Surface: 2800 miles at full power (design) |
| Surface: 2850 miles at full power or 3600 miles at half full power (service) | |
| Submerged: 14 miles at full power (design) | |
| Submerged: 14 miles at full power or 65 miles at 5 knots (service) | |
| Armament | 4 x 18 inch bow tubes |
| 2 x 18 inch beam tubes | |
| (10 torpedoes carried) | |
| 1 x 4 inch gun | |
| Complement | 35 |
| Oberon (N21) | |
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| Class: | 1924 - 1945: Oberon Class |
| Built By: | Chatham Dockyard (Medway) |
| Build Group: | O1 |
| Read More | |
| Class: | 1956 - 1988: Porpoise Class |
| Built By: | Cammell Laird (Mersey) |
| Build Group: | P2 |
| Fate: | |
| Removed from disposal list and taken in hand at Portsmouth to be converted as a static underwater target during 1980 and sunk off the coast of Scotland in the same year. | |
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