| Built By: | Scotts (Clyde) |
| Build Group: | S1 |
| 23-08-1912 | Laid Down |
| 28-02-1914 | Launched |
| 05-08-1914 | 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. |
The Royal Navy planned to build midget submarines capable of planting a nuclear weapon inside Russian harbours, documents newly released at the Public record Office have revealed. Designs were drawn up for the so-called X-craft, which was a development on similar devices that had been used in the 1939-1945 War on missions, including the crippling of the German battleship, Tirpitz.
| Class: | 1943 - 1977: Amphion Class |
| Built By: | Scotts (Clyde) |
| Build Group: | Amphion |
| Fate: | |
| Sold for scrap in 1972 after sinking alongside at Dolphin trot 1. | |
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