So the other night I was watching a show on finding lost ww2 subs sunk by the US Navy off Hawaii. And found out that the I-201 class subs by Japan were in many ways better then the type XX1 by German. I know about the I subs that can carry 3 or 4 airplanes but these I-201 are smaller and very fast. But they only made 3 by wars end.

http://en.wikipedia.org/wiki/I-201_class_submarine

Cool sub, thanks