IJN I-168

The Japanese submarine I-168 (I-68, until 20 May 1942) was a Kaidai type of cruiser submarine active in World War II. A KD6 sub-class boat, I-168 was built for the Imperial Japanese Navy (IJN) in the early 1930s. At the Battle of Midway she sank the only American warships lost in the battle: the aircraft carrier USS Yorktown and the destroyer USS Hammann. At that time she was commanded by Lieutenant Commander Yahachi Tanabe.