The Japanese military did not cooperate with the axis navies. Their enemies were in the Pacific Ocean, so they would not have sent ships to the Atlantic. The allies controlled the locks at Panama, so if Japanese ships wanted access to the Atlantic, they would have had to have sailed south between South America and Antarctica.
So, no, the Japanese subs and ships did not play an important role in the "battle of the Atlantic", whatever that would have been.
I-Boats were WWII Japanese submarines.
During World War II, submarines played a crucial role in naval warfare, particularly with Germany's U-boats and the Allies' submarines like those from the United States and the United Kingdom. U-boats targeted merchant ships in the Atlantic, disrupting supply lines and contributing to the Battle of the Atlantic. Allied submarines, especially in the Pacific, effectively attacked Japanese shipping and naval forces, significantly weakening their logistics. The use of submarines marked a shift in naval strategy, emphasizing stealth and surprise in maritime combat.
1972
There were five midget Japanese submarines : I-16, I-18, I-20, I-22, and I-24 .
Submarines and Aircraft Carriers
5
Depth charges.
Short answer: The Japanese attacked with airplanes from six aircraft carriers, and they also used submarines. The standard-sized submarines were in the Hawaiian waters outside of Pearl Harbor, and midget submarines were sent into Pearl Harbor itself. Details on the web.
9
In and around Sydney Harbour
300
The Japanese bombed Pearl Harbor in bomber planes, fighter planes, submarines, and torpedo bombers. They also planned to use midget submarines but most didn't make it.