The submarine HNMS O 25 of the Royal Dutch Navy.
Technical information
| Type | Submarine |
| Displacement | 990 / 1205 BRT |
| Length | 77.7 m |
| Complement | 39 men |
| Armament | 1 3.5" gun 2 40mm (2x1) 1 12.7mm MG 8 21" torpedo tubes (4 bow, 2 stern, 2 external amidships) 14 torpedoes |
| Max speed | 19.5 / 9 knots (surfaced/submerged) |
| Engines | Diesels / Electric, 2 shafts |
| Power | 5000 / 1000 HP (surfaced/submerged) |
| Notes on class | Submarines of this class that have detailed patrol info added are shown in bold in the list below. |
All ships of the O 21 class
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 | HNMS O 21 (P 21) | |
| | HNMS O 22 (P 22) | Lost on 19 Nov 1940 |
| | HNMS O 23 (P 23) | |
| | HNMS O 24 (P 24) | |
| | HNMS O 25 | |
| | HNMS O 26 | |
| | HNMS O 27 | |
Full wartime service history on this vessel. | ||
Royal Dutch Navy (more on See all Submarine classes.
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Books dealing with this subject include:
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