that there's not an optimum diameter for torpedoes because air dropped and ship launched American torpedoes had different diameters. That still leaves a mystery. Did the Germans plan on capturing superior American submarines and using them against the coutry of their origin?
Were the British going to ally with the Germans and have compatible torpedoes? Were they all taught to make torpedoes by the same advanced extraterrestrial life form? And what about Mary Lou?
Edit: hey man, those space aliens do get around. I found a
list of the world's torpedoes and although there are many torpedoes that are not 21" or 533mm, the US, UK, Holland, USSR, China, Germany, Japan, and Sweden all use or have used that diameter torpedo! I am sure there are probably others and we could plot the course of the flying saucer around the world. This is truly bizarre!