Der Teufel Germany's Super Submarine
by Grandpa Casey
As the Great War (World War One) raged on, Germany realized they needed submarines capable of reaching Canada, sinking cargo ships and returning to Germany, without refueling.
While the first such submarine, code named Der Teufel (The Devil), was still being build, two British Agents were sent to find and destroy it. To this day, no records were ever found and both sides deny it ever exited