German submarine U-20

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Science and technology

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What Wikipedia says

German submarine U-20 was a Type IIB U-boat of Nazi Germany's Kriegsmarine. Her keel was laid down on 1 August 1935, by Germaniawerft of Kiel as yard number 550. She was commissioned on 1 February 1936. During World War II, she conducted operations against enemy shipping.

Excerpt from the Wikipedia article “German submarine U-20 (1936)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: not identified. "Official photograph", Public domain, via Wikimedia Commons.