Preceded by:
NoneSucceeded by:
None| Ship | Code | Builder | Laid | Launch | Comm | Decomm | Fate | ||
 |
O-21 | / S801 | De Schelde | 20/11/1937 | 21/10/1939 | 10/05/1940 | 02/11/1957 | Sold/Scrapped | |
|
O-22 † | De Schelde | 20/11/1937 | 20/01/1940 | 10/05/1940 | 08/11/1940 | † | Loss by mine | |
|
O-23 | Rotterdamse Droogdok Mij | 12/10/1937 | 05/12/1939 | 13/05/1940 | 01/12/1948 | Sold/Scrapped | ||
|
O-24 | / S804 | Rotterdamse Droogdok Mij | 12/11/1937 | 18/03/1940 | 13/05/1940 | 22/02/1954 | Sold/Scrapped | |
|
UD-3 | Wilton-Fijenoord | 10/04/1939 | 01/05/1940 | - | - | Captured/Surrendered | ||
|
UD-4 | Rotterdamse Droogdok Mij | 20/04/1939 | - | - | - | Captured/Surrendered | ||
|
UD-5 | Rotterdamse Droogdok Mij | 03/08/1939 | - | - | - | Captured/Surrendered |
| Ship | Code | Former | Code | Comm | Decomm | Fate | |||
 |
O-25 † | (Unnamed) | 08/06/1941 | 03/05/1945 | † | Scuttled active | |||
|
O-26 | (Unnamed) | 28/01/1941 | 19/03/1945 | Scuttled inactive | ||||
|
O-27 | (Unnamed) | 30/01/1942 | 09/05/1945 | Returned | ||||
|
O-27 | S807 | (Unnamed) | 13/07/1945 | 14/11/1951 | Sold/Scrapped | |||