The past has always been an interest of mine, especially the past World Wars and how fate inter-acted with "Chance" on who won the War.
Well here is an article that provides some insight on how close Germany came to tilting the scale in there direction in having a "one up on the US."
The following is an intro into the article: In a last-ditch attempt to win the Atlantic War, Hitler's production geniuses created a fast, silent-running, deep-diving, hard-to- detect submarine that revolutionized Naval warfare even though it came along too late to save the day.
If you would like to give this a "look see"....just click: HERE