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 tender Komahashi
, was an auxiliary vessel operated by the Imperial Japanese Navy, serving from the 1910s through World War II. Her classification changed numerous times during her operational life. Although officially designated as a submarine tender for most of her career, "Komahashi" very rarely functioned in this role, but was used instead as an oceanographic survey vessel throughout the Pacific, and as a "kaibokan" escort vessel for convoys of merchant ships during the Pacific War.