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 Karasaki
At the end of 1904, "Karasaki Maru" was sent to the Yokosuka Naval Arsenal for conversion into a submarine tender. She was officially commissioned into the Imperial Japanese Navy on 4 July 1905. On 8 March 1906, she was renamed "Karasaki", and was officially re-designated as a torpedo boat tender. In August 1912, the Imperial Japanese Navy abolished the torpedo boat tender classification, and "Karasaki" was re-designated as a second-class "kaibokan". However, the designation of torpedo boat tender was revived in April 1920. From 1924, "Karasaki" was then assigned to the submarine training school at Kure Naval District, and from 1 December 1924, was again officially designated as a submarine tender.