Submarines changed war. They played a big part of World War I and II.
Bigger, Faster, Deeper, Comfortable, Deadlier.
Why don't you just Google "World War 1 Submarines?"
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.
Yes
52 US submarines were lost in WW2. This was about 1 in every 5 submarines that the US had in WW2
Yes, many submarines were used in WW1 by most of the major combatants.