17 jan 1917 ano - U-boat

Descrição:

U-boat short for unterseeboot which means under see boat. they were used to blow up battle ships with out alerting the crew.

1.https://cdn.britannica.com/s:500x350/44/159744-004-D58C9A3A.jpg

2.https://cdn.britannica.com/s:300x300/11/60711-004-1DA5E38D.jpg

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