Nah,i needed something fast to test-sink my ship.
I took as example the "Maiale" (Pig) of the old Royal Italian Navy,modified a bit and Voilà
Curiously they nicknamed them Pig Because they were difficult to steer it seems.
This little beast is the exact opposite.
Anyway,for now i stay clear from creating normal submarine.They need first to add more powerful pumps or high pressure air tanks.

I made almost the exact same thing but with a conning tower and several rooms. i based it off of german ww2 subs and put a giant ram on the front