page_title: O 21-class submarine
hierarchical_section_title: O 21-class submarine
caption_attribution_description: English: HNLMS O 21 entering the harbor Gibraltar. Nederlands: Hr. Ms. O 21 vaart de haven van Gibraltar binnen.
context_page_description: The O 21 class was a class of seven submarines, built for the Royal Netherlands Navy. The ships 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 ships and they entered German service as UD-3, UD-4 and UD-5. The submarines diving depth was 100 metres.
context_section_description: The O 21 class was a class of seven submarines, built for the Royal Netherlands Navy. The ships 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 ships and they entered German service as UD-3, UD-4 and UD-5. The submarines diving depth was 100 metres (330 ft).
caption: HNLMS O 21
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