What I´ve learned here, is that a submarine is a boat that travels under water more than it does on surface, ergo the newer ones. I know they do travel alot on the surface, but no where near as much as the older ones.
A u-boat here is a ship that has the possibility of going submerged, but travels most of the time surfaced.
Thats what I´ve learned, but I guess its different in the states then.
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