Technical information
| Type | Submarine |
| Displacement | 1850 / 2723 BRT |
| Length | 345 feet |
| Complement | 6 officers + 55 men |
| Armament | 1 4" gun 2 MG AA 6 21" torpedo tubes (6 bow) |
| Max speed | 22.25 / 10 knots (surfaced/submerged) |
| Engines | Diesel / Electric, 2 shafts |
| Power | 10000 / 2500 HP (surfaced/submerged) |
| Notes on class | This class of submarines was sometimes known as the "Thames" class.
They were designed to operate with the fleet. Thames had a slight different displacement 1805 / 2680 BRT. |
All ships of the River class
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| HMS Clyde (N 12) | ||
| HMS Severn (N 57) | ||
| HMS Thames (N 71) | Lost on 3 Aug 1940 | |
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Royal Navy (more on See all Submarine classes.
 Fight for the Sea Turner, John Frayn |
Books dealing with this subject include:
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