U-boat
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U-boats were naval submarines operated by Germany, particularly in the First and Second World Wars. The term is an anglicised version of the German word U-Boot, a shortening of Unterseeboot, though the German term refers to any submarine. Austro-Hungarian Navy submarines were also known as U-boats.
The first German submarine, the SM U-1.
The German submarine U-14, showing the kerosene vapour trail.
Sea mines are loaded in a UC coastal submarine in the harbour of Zeebrugge
Kiel
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Kiel is the capital and most populous city in the northern German state of Schleswig-Holstein, with a population of 246,243 (2021).
Image: Kiel Luftaufnahme 02
Image: Ayuntamiento, Kiel, Alemania, 2019 09 10, DD 96 98 HDR
Image: Schifffahrtsmuseum Kiel 2014
Image: Laboe U995