I-2 was a "J1 type" cruiser submarine built by Kawasaki, Kobe, for the Imperial Japanese Navy. She was a large cruiser submarine displacing 2,135 tons that entered service in 1926 and served in the Second Sino-Japanese War and World War II. During the latter conflict she operated in support of the attack on Pearl Harbor, conducted anti-shipping patrols in the Indian Ocean, supported the Indian Ocean raid, and took part in the Aleutian Islands campaign , the Guadalcanal campaign, Operation Ke, and the New Guinea campaign before she was sunk in April 1944.