SM UB-53
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SM UB-53 was a German Type UB III submarine or U-boat in the Imperial German Navy during World War I. She was commissioned into the Pola Flotilla of the German Imperial Navy on 21 August 1917 as SM UB-53.
UB-148 at sea, a U-boat similar to UB-53.
German Type UB III submarine
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The Type UB III submarine was a class of U-boat built during World War I by the German Imperial Navy.
UB-86 washed ashore 1921
Image: German Type UB III submarine model 1
Image: German Type UB III submarine model 3