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Submarine Warfare - German Uboats Documentary - Documentary Films (Official) U-boat is the anglicised version of the German word U-Boot [ˈuːboːt] . Focuses on US submarines in the Pacific Ocean. history life discovery science technology tech learning education national nature geographic earth planet . U-BOATS: The Most Feared Fighting Ships Of The Battle - World Documentary Films HD. U-boat is the anglicised version of the German word U-Boot . DEEP SEA DETECTIVES: MYSTERY U-BOAT OF WORLD WAR I A veteran of the brutal naval battles of World War I, the German submarine UB-107 was .