Ah yes, the enemy of all, the USS Beast. The US navy hates em pirates, The Japanese tooo.

The Type A Ko-hyoteki (甲標的甲型, Kō-hyōteki kō-gata, Target 'A', Type 'A') class was a class of Japanese midget submarines (Ko-hyoteki) used during World War II. They had hull numbers but no names. For simplicity, they are most often referred to by the hull number of the mother submarine. Thus, the midget carried by I-16-class submarine was known as I-16's boat, or "I-16tou."
by Wikipedia．
@Tabris

@hamu05210420 use google Wikipedia yes its not the best source but thats then where the comments come in

I'm sorry, I'm not familiar with the Japanese army…
I don't even know how this weapon was made.@Tabris

@hamu05210420 add info on this give details a little bit of history it'll help draw more to it

I've fixed it now.@SodiumChloride

Oh, it's a mistake I didn't notice. I'm sorry.@SodiumChloride