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-201
The "I-201"-class submarines were derived from the experimental high-speed Submarine "No.71". They displaced surfaced and submerged. The submarines were long, had a beam of and a draft of . The boats were the deepest-diving Japanese submarines of the war and had a diving depth of .