Yes
U-boats were German submarines. in the second world war their job was to sink merchant ships to cut oof supplies from America going to Britain.
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.
Wolfpack
326
Underseaboats.U-boats
Both sides, the Allies and the Axis, had submarines when WW2 started.
The British lost 76 submarines during WWII.
52
Underseaboats.U-boats
9
759