I think the OP is absolutely lacking in the history of the german U boats.
The type XVIII is inculded as a "What if" choice.
This boat would have been a true threat if the problems with the Walter drive were worked out. (people can argue they would have been an equal threat to both side of the coin)
It is not designed to operate on the surface. In case you did not know U-boats were sitting ducks for the RAF and coastal command later in the war when they were on the surface day OR NIGHT.
I don't understand why the simulation of the Type XVIII lacks a snorkel cause it is my understanding all boats of period of the war had the device.
The type XXI is a direct decendent of the type XVIII of which two were being built, but were converted on the slips over to the Type XXI form.
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