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Not to long ago I started a thread on the Germans potentially using one of their assault U-Boat sub models as a makeshift amphibious landing boat for small raids. (determined to be pretty implausible)
But what if instead the Germans had use one of there uboat tankers/ressupply subs as a troop transport vessel?
It carried no torpedoes which gave it far more efficient use of space internally for supplies and it's crews.
So again, it seems nominal to just replace said supplies with men and small arms for a massive raid or possible island invasion.