the submarine played a key part in World War 2 for many countries, Germany used them extensively against British shipping and to destroy royal navy ships, the British used them again to destroy a few well known German ships, Japan had submarines as well like the midget submarine they also used to attack the US, ad the united states also had submarines in the pacific theater.
600 ft is threshhold
The U-boat submarine
24 hours
USS Shark
United States Submarine Operations in World War II was created in 1949.
It was a submarine in World War 1 or 2
A U-boat was a submarine used by Germany in World War 1 and World War 2.
It was a submarine in world war 1 or 2
u boat
Underseaboat.
Asdic
Was the humboldt a submarine?
600 ft is threshhold
underwater submarine
a Japanese i class submarine
The U-boat submarine
24 hours