I think they made a horrible (and common) mistake in that show. THE MIDGET DIDN'T CARRY THE LONG LANCE! I alway want to scream when they say this

. The long lance that was really devasating was the Tyep 93 THE SURFACED launced torp. The sub version was the type 95 and I read it somewhere that they didn't manufacture a lot of them. The midgets used they Type 97. The interesting thing about these torps is that they were horribly unreliable (leaky oxygen tanks). The show was pretty good though. Discovery channel did a show on this also, where they made a mock up of pearl harbor and investigated the rooster tail in that famous picture.