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This topic has appeared in the trending rankings 1 time(s) in the past year. While it does not trend frequently, its appearance suggests a renewed or concentrated surge of public interest.
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German_submarine_UD-4 entered the ranking for the first time today at position #. This is its highest position ever recorded.
This topic has appeared in the English Wikipedia rankings 1 time. It first appeared on 2026-08-12 and was most recently seen on 2026-08-12.
UD-4 was an O 21-class submarine built for the Royal Netherlands Navy during the 1930s for European service. The boat was captured incomplete during the German invasion of the Netherlands in May 1940 during World War II and was later commissioned into the Kriegsmarine as UD-4. The submarine served as a training boat during the war. She was decommissioned in early 1945 and scuttled in May 1945.
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