German submarine U-138

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Invention

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Science and technology

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What Wikipedia says

German submarine U-138 was a Type IID U-boat of Nazi Germany's Kriegsmarine in World War II. Her keel was laid down on 16 November 1939 by Deutsche Werke in Kiel as yard number 267. She was launched on 18 May 1940 and commissioned on 27 June 1940 with Oberleutnant zur See Wolfgang Lüth in command.

Excerpt from the Wikipedia article “German submarine U-138 (1940)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia