The Type 3M U-Boat is smaller version of the Type 3 Submarine. I am not sure how well I did on this though. :/
About this creation
You can say I copied Vanguard's U-Boat. You'd be more or less correct. Although, his U-Boat is amazing and wayyy better than mine. The Type 3M has (including the pre-loaded torpedos in the tubes) 10 200kg Torpex torpedos. In addition, it is armed with a small surface cannon for taking out light targets. The inside can hold 16 Men ((two men per bunk >:) )). The engine uses a revolutionary design, capping the excess Carbon Monoxide into bottles that can be dispersed one the submarine surfaces. This design is to keep position-giving-away bubbles to the minimum. If you think I should add any more details, then tell me, but for now, goodnight!
Oh yeah, one more thing, that is a prototype hull I made for a large submarine. What do think? I call it the Type Fail Submarine Hull. :3