There were five midget Japanese submarines : I-16, I-18, I-20, I-22, and I-24 .
During World War 2, it is reported that over 2,000 variants of Japanese Submarines were used during World War 2. Out of this, it is estimated that 10,000s were likely to be used during WW2.
About 435. Any consensus?
2,200,000 Soldiers 97 Warships 40 Submarines.
Shallow diving submarines are used for reef watching in many parts of the world.
Yes, many submarines were used in WW1 by most of the major combatants.
The British lost 76 submarines during WWII.
1, 200,000 Soldiers 30 Warships 11 Submarines.