| Built By: | Scotts (Clyde) |
| Build Group: | S1 |
| Fate: | To Italy 25th October 1915 |
| 04-03-1914 | Laid Down |
| 10-06-1915 | Launched |
| 25-09-1915 | 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 | 48 |
| 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. |
Alec was in the RN Submarine Service during WW2, and he was a chef (he remembers that after five days the bread would turn green and so he would have to cut off the edges, dip it in water and put it back in the oven). He never really felt nervous on the submarines but if he heard the air raid sirens while he was on leave at home he would run to the nearest pub and seek comfort in a pint of beer. He felt more safe in the pub than in a shelter! This is his story
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