Did the Imperial Japanese Navy also have submarines?
Submarines of the Imperial Japanese Navy
Imperial Japanese Navy submarines originated with the purchase of five Holland type submarines from the United States in 1904. Japanese submarine forces progressively built up strength and expertise, becoming by the beginning of World War II one of the world's most varied and powerful submarine fleets.
Japanese submarine I-27
I-27 was a submarine of the Imperial Japanese Navy which saw service during the Pacific Campaign of World War II. "I-27" was commissioned at Sasebo, Japan on February 24, 1942.