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About: List of German U-boats in World War II (1-599)     Goto   Sponge   NotDistinct   Permalink

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The German military submarines known as U-boats that were in action during World War II were built between 1935 and 1944, and were numbered in sequence from U-1 upwards. Numbering was according to the sequence in which construction orders were allocated to the individual shipyards, rather than commissioning date; thus some boats carrying high numbers were commissioned well before boats with lower numbers. Later in the war, whole contracts for older designs were sometimes cancelled in favour of newer designs, with the numbers allocated being reused later.