D-class submarines
D-class submarine statistics:
| Number completed before 1919 | 8 |
| Number completed after 1919 | 0 |
| Lost in action | 3 |
| Lost accidentally | 1 |
| Prototype date | 1910 |
| Surface tonnage | 550 |
| Submerged tonnage | 620 |
| Length | 162 feet |
| Engine | Diesel |
| Horsepower | 1,750 |
| Screws | 2 |
| Surface speed | 16 knots |
| Submerged speed | 10 knots |
| Torpedo tubes | 18 inches |
| Number of torpedoes tubes | 3 |
| Guns | 12 pounder |
| Crew | 25 |
