I-400-class submarine

The I-400-class submarine is a type of Japanese submarine that appears in Battlestations: Pacific. It was the largest submarine in the world before the nuclear ballistics submarines of the cold war appeared. They carried enough fuel to go around the globe one and a half times and had a hangar that could store 3 seaplanes. The seaplane launched by the I-400-class is the M6A Serian.

The I-400 Class submarines, also called 'Sen Toku' were the largest submarines ever built in World War II, and also the largest submarines built before the huge nuclear ballistics submarines of the cold war. Capable of going around the world one and a half times. The boat has eight torpedo tubes mounted forward, a large deck gun and a number of 25mm guns for anti-air defense. The I-400 also carries three M6A Serian airplanes in a large, cylindrical hangar built in the boat. The Seirans can carry a torpedo or bombs up to 800kg and have a great speed and long range, extending the offensive capabilities of the I-400.

Trivia

 * Despite being called a very good submarine, it has a major weak point, which is the fact all of it's torpedo tubes are located at the front, which means it would have to turn 180 degrees around to fire at a target behind it.
 * To make up for this, it could deploy it's M6A Serian which carries bombs, but the submarine still has to surface and be exposed to enemy warships on the surface.