SM U-21

Rarity: Common

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At a glance

Class

Invention

Domain

Science and technology

Knowledge cost

6

In collections

Nobody has pulled it yet.

What Wikipedia says

SM U-21 was a Type U 19 U-boat built for the Imperial German Navy shortly before World War I. The third of four Type U-19-class submarines, these were the first U-boats in German service to be equipped with diesel engines.

Excerpt from the Wikipedia article “SM U-21 (Germany)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Bain News Service, Public domain, via Wikimedia Commons.