I remember I used to be all into reading about military stuff when I was younger (back in the 80's). I knew just about every piece of equipement we had in our arsenal. My dad used to work at a Navy Yard and they made shafts and propellers there. I remember asking him what they're doing at work, and he said they were making shafts and props for a sub. I asked what him what kind and he said "Seawolf Class" subs. I remember thinking that he didn't know what he was talking about because there was no such thing, hahhaa.