Submarines of the Imperial Japanese Navy
The ("I-15"-class) submarines (, , , , , , , , , , , , , , , , , , , ) were the most numerous type of submarines of the Imperial Japanese Navy during World War II. In total 20 were made, starting with "I-15", the class ship. These were fast, very long ranged, and carried a single Yokosuka E14Y seaplane, located in a hangar in front of the conning tower, launched by a catapult.
Japanese submarine I-73
"I-73" participated in the attack on Pearl Harbor as part of the 3rd Submarine Squadron in the 6th Fleet of the IJN. It was one of the vessels created as part of Japan's 1st Naval Armaments Supplement Programme in 1931. On 27 January 1942, "I-73" became the first warship to be sunk by a United States Navy submarine; USS "Gudgeon" fired three torpedoes at "I-73" and destroyed it. "Gudgeon" claimed that the torpedoes only damaged "I-73", but Station HYPO confirmed the loss.