Shortest Submarine in the Game?

I've been looking for a short submarine to proxy for the Finnish sub, Vesikko.  According to stats I found on Wikipedia, it was about 41m.  I looked through cards thinking the Ambra, S-37 or some other sub might be a good proxy.   It seems those subs were in the 60-ish m range and those are the shortest I could find.   

Is there a shorter submarine that anybody is aware of that produced in the game?   If not, I'll go the 3D route, but thought it was worth asking.  Thanks.