German submarine U-23

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Science and technology

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What Wikipedia says

German submarine U-23 was a Type IIB U-boat of Nazi Germany's Kriegsmarine, built in Germaniawerft, Kiel. She was laid down on 11 April 1936 and commissioned on 24 September.

Excerpt from the Wikipedia article “German submarine U-23 (1936)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

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