1. Some Japanese mini-subs reached US territory in 1941 (Pearl Harbor). 2. One Japanese submarine shelled Santa Barbara California with it's deck gun. 3. One Japanese submarine launched an airplane which bombed Brookings, Oregon.
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.
5
9
300
138
Shallow diving submarines are used for reef watching in many parts of the world.
2,200,000 Soldiers 97 Warships 40 Submarines.
About 435. Any consensus?
Yes, many submarines were used in WW1 by most of the major combatants.
1, 200,000 Soldiers 30 Warships 11 Submarines.
The British lost 76 submarines during WWII.