Yes, German submarines were very effective in both world wars. The Germans built excellent submarines and still do.
Atlantic Ocean.
Wolfpack
Underseaboats.U-boats
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Submarines, commerce raiding.
U-boats. (German submarines)
Oilers then merchantmen.
The name U-boat was applied to German submarines.
The submarines were either called "submarines" or "U-boats." The German submarine was called the "U-boat"
'U-boats' was the name given to German submarines in both the first and second world war.
They're german submarines, used in world war 1 and world war 2
German submarines took the war all over the Caribbean Sea.