O 21-class submarine
Class of ship
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... Wikipedia
Built: 1937–1940
O 21, laid down K XXI was an O 21-class submarine of the Royal Netherlands Navy that saw service during World War II. During the war she sank several ships, ...
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