O 21-class submarine
From Warlike
The O 21 class was a class of seven submarines, built for the Royal Netherlands Navy. The boats were still incomplete at the start of the German invasion of the Netherlands, O 21, O 22, O 23 and O 24 were hastily launched and escaped to the United Kingdom. O 25, O 26 and O 27 were not able to escape and were captured by the German forces. The Kriegsmarine ordered the completion of the boats and they entered German service as UD-3, UD-4 and UD-5. The submarines' diving depth was 100 meters (330 ft).
Wikidata
Kriegsmarine, 
UD-3, UD-4, UD-5,
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Location: KML, Cluster Map, Maps,
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UD-3 ⓘ
1940 O 21-class submarine -
UD-4 ⓘ
UD-4 was a Dutch submarine and in World War II commissioned in the Kriegsmarine -
UD-5 ⓘ
1941 O 21-class submarine
| Type | Subtype | Date | Description | Notes | Source |
|---|---|---|---|---|---|
| object | watercraft | UD-3 | O 21-class submarine, U-boat | Wikidata | |
| object | watercraft | UD-4 | O 21-class submarine, U-boat | Wikidata | |
| object | watercraft | UD-5 | attack submarine, O 21-class submarine, U-boat | Wikidata | |
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