WW2 Documentary - Submarines - History Channel
Channel: 70s Gamer
Date: 2018-08-16

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In World War 2, as they did in World War 1, submarines were widely used by both sides as the ultimate weapon of naval blockade, sinking large numbers of both merchant ships and warships, resulting in either paralyzing the enemy's military industry and war effort by causing severe shortages of war materials and products. 



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