In order to make up for the disadvantage of the number of warships, SRK decided to build a batch of special warships with both reconnaissance and assault functions. This type of special warship is equipped with reconnaissance airships and long-range thrusters. In addition, confidential models of torpedoes and mines were also equipped on battleships for combat testing. These torpedoes have the appearance of a meteorite camouflage. These special warships are called "special-type air submarine ships", and the two known as I-400 and I-401 are currently in service.
In order to deal with the enemy's increasingly powerful anti-potential capacity, the I-401 was replaced with a meteorite-shaped camouflage shield.