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Yes, German submarines were very effective in both world wars. The Germans built excellent submarines and still do.
World War I submarines were primarily used to locate and attack surface cargo and warships.
Submarines were sometimes referred to as submersibles.
The submarines were either called "submarines" or "U-boats." The German submarine was called the "U-boat"
Shallow diving submarines are used for reef watching in many parts of the world.
2,200,000 Soldiers 97 Warships 40 Submarines.
Submarines changed war. They played a big part of World War I and II.
Yes
52 US submarines were lost in WW2. This was about 1 in every 5 submarines that the US had in WW2
German submarines were referred to as U-boats during the world wars.
Both sides, the Allies and the Axis, had submarines when WW2 started.