the lemur
Senior Member
If I recall correctly from a book on Toronto I have, it's a captured WWI German U-boat.
Yes, it appears to have been surrendered to the US after the armistice (not having engaged in any patrols or sunk any ships) and was taken on a tour of the Great Lakes to sell Victory Bonds.
http://articles.chicagotribune.com/1998-01-28/features/9801280009_1_submarine-uc-great-war