| Built By: | Vickers (Barrow) |
| Build Group: | XT |
Unofficially named Herald
Less elaborately equipped as previous boats as they were intended for training.
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| Length overall | 51 ft 7 inch |
| Beam | 8 ft 6 inch (with charges) |
| 5 ft 9 1/2 inch (without charges) | |
| Displacement | Without Charges: 27 tons (surface) |
| Without Charges: 29 1/2 tons (submerged) | |
| Diving Depth | 300 ft |
| Speed | With Charges: 6.5 knots (surface) |
| With Charges:5 knots (submerged) | |
| No. of shafts | 1 |
| Armament | 2 x 2-ton side charges |
| Limpet mines | |
| Endurance | Surface: 1320 miles at 4 knots (with charges) |
| Surface: 1860 miles at 4 knots (without charges) | |
| Submerged: 80 miles at 2 knots (with charges) | |
| Complement | 4 |
The British submarine, M1 which uniquely carried the firepower of a battleship was discovered 35 miles south-east of Plymouth at a depth of 81 metres by diver and submarine expert, Innes McCartney and boat skipper Grahame Knott.
| Class: | 1929 - 1946: Rainbow Class |
| Built By: | Chatham Dockyard (Medway) |
| Build Group: | R2 |
| Fate: | |
| 4th October 1940, while attacking a convoy Rainbow collided with the Italian M/V Antonietta Costa and was lost with all hands. | |
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