The German U-1

I learned that the U-1 was one of the earlier German U-Boats. Also I found out that compared with other ships of its time, the U-1 was relatively small. It held three torpedoes and it also only had a crew of ten men. Through many trials, the Germans found out that the U-1 was not suitable for open ocean use. Therefore it was only used for coastline exercises. The U-1 never got to see heavy combat action due to the fact that its kerosene engines produced heavy amounts of white smoke, which made the ship very visible.