| Built By: | Vickers (Barrow) |
| Build Group: | R |
| Fate: | Broken Up February 1923 |
| 01-11-1917 | Laid Down |
| 28-06-1918 | Launched |
| 26-07-1918 | Completed |
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| Length overall | 163 ft 9 inch |
| Beam | 15 ft 9 inch |
| Depth | 15 ft 3 inch |
| Displacement | 410 tons (surface) |
| 503 tons (submerged) | |
| Diving Depth | 150 ft |
| Speed | Surface 15 knots (design) |
| Surface 15 knots (service) | |
| Submerged 9.5 knots (design) | |
| Submerged 9.5 knots (service) | |
| Endurance | Surface: 2000 miles at 9 knots (design) |
| Surface: 2400 miles at full power (service) | |
| Submerged: 15 miles at full power (design) | |
| Submerged: 15 miles at full power or 150 miles at 1.5 knots (service) | |
| No. of shafts | 1 |
| Armament | 6 x 18 inch bow tubes (7 torpedoes carried) |
| Complement | 2 officers, 20 ratings. |
Fort Blockhouse had its beginnings as a military base in 1431 when Henry VI authorised a tower to be built on the Gosport side of Portsmouth Harbour. The Navy moved into Fort Blockhouse in 1905 for the purpose of establishing a Submarine Boat Station.
| Class: | 1943 - 1977: Amphion Class |
| Built By: | Vickers (Barrow) |
| Build Group: | Amphion |
| Fate: | |
| Scrapped in July 1971 at Inverkeithing. | |
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